Remove all legacy POS button colors. Replace existing usage with DS color.

Author: jaclync

WooCommerce/Classes/POS/Presentation/PointOfSaleCollectCashView.swift

@@ -179,7 +179,7 @@ private extension PointOfSaleCollectCashView {
     }
 
     private var navigationForegroundColor: Color {
-        isLoading ? .posBackgroundButtonDisabled : .primary
+        isLoading ? .posDisabledContainer : .primary
     }
 
     enum Localization {

WooCommerce/Classes/POS/Utils/Color+WooCommercePOS.swift

@@ -37,31 +37,6 @@ extension Color {
             )
         )
     }
-
-    // MARK: - Buttons
-
-    static var posPrimaryButtonBackground: Color = .posAccent
-
-    static var posSecondaryButtonForeground: Color = .posAccent
-
-    static var posTextButtonForeground: Color = .posAccent
-
-    static var posTextButtonForegroundPressed: Color {
-        return Color(
-            UIColor(
-                light: .withColorStudio(.wooCommercePurple, shade: .shade60),
-                dark: .withColorStudio(.wooCommercePurple, shade: .shade40)
-            )
-        )
-    }
-
-    static var posTextButtonDisabled: Color {
-        return .posGray
-    }
-
-    static var posBackgroundButtonDisabled: Color {
-        return .init(red: 195.0 / 255.0, green: 196.0 / 255.0, blue: 199.0 / 255.0)
-    }
 }
 
 // MARK: - Non-adaptive colors