fix(scripts: darker): convert hex to int before math

scripts/darker.sh

@@ -5,7 +5,8 @@ set -ueo pipefail

                                
                                
                                
                            
                                
                                    
                                        
                                            5  
                                            darker_channel() {
                                        
                                        
                                            
                                            
                                            
                                            
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        
                                            6  
                                              value="$1"
                                        
                                        
                                            
                                            
                                            
                                            
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        
                                            7  
                                              light_delta="$2"
                                        
                                        
                                            
                                            
                                            
                                            
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        8 -
                                          result="$(bc <<< "ibase=16; $value - $light_delta")"
                                        
                                        
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        8 +
                                          value_int="$(bc <<< "ibase=16; $value")"
                                        
                                        
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        9 +
                                          result="$(bc <<< "$value_int - $light_delta")"
                                        
                                        
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        
                                            10  
                                              if [[ "$result" -lt 0 ]]; then
                                        
                                        
                                            
                                            
                                            
                                            
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        
                                            11  
                                                result=0
                                        
                                        
                                            
                                            
                                            
                                            
                                        
                                    
                                
                                
                                
                            
                                
                                    
                                        
                                            12  
                                              fi