gnome-shell 40: Add background-color to app folder icon again

src/gnome-shell/sass/components/overview/_app-grid.scss

@@ -179,7 +179,12 @@

                                
                                
                                
                            
                                
                                    
                                        
                                            179  
                                              }
                                        
                                        
                                            
                                            
                                            
                                            
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        
                                            180  
                                            }
                                        
                                        
                                            
                                            
                                            
                                            
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        
                                            181  
                                            
                                        
                                        
                                            
                                            
                                            
                                            
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        182 -
                                        @if $version < 40 {
                                        
                                        
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        182 +
                                        @if $version >= 40 {
                                        
                                        
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        183 +
                                          .app-well-app.app-folder > .overview-icon > StBoxLayout > StBin > StWidget {
                                        
                                        
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        184 +
                                            border-radius: $corner-radius;
                                        
                                        
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        185 +
                                            background-color: fill($on-dark);
                                        
                                        
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        186 +
                                          }
                                        
                                        
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        187 +
                                        } @else {
                                        
                                        
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        
                                            188  
                                              .app-folder-icon {
                                        
                                        
                                            
                                            
                                            
                                            
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        
                                            189  
                                                padding: 8px;
                                        
                                        
                                            
                                            
                                            
                                            
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        
                                            190  
                                                spacing-rows: 4px;