fix: set color for efficiency and performance cores in the BarChart widget based on the selected color in the popup view settings (#1686)

Kit/extensions.swift

@@ -201,22 +201,6 @@ public extension Double {
         }
     }
     
-    func clusterColor(_ i: Int) -> NSColor? {
-        guard let cores = SystemKit.shared.device.info.cpu?.cores,
-              let core = cores.first(where: {$0.id == i }) else {
-            return nil
-        }
-        
-        switch core.type {
-        case .efficiency:
-            return .systemTeal
-        case .performance:
-            return .systemBlue
-        default:
-            return nil
-        }
-    }
-    
     func secondsToHoursMinutesSeconds() -> (Int, Int) {
         let mins = (self.truncatingRemainder(dividingBy: 3600)) / 60
         return (Int(self / 3600), Int(mins))