Fix demo

Author: danielsaidi

Demo/iOS/EditorScreen.swift

@@ -59,7 +59,8 @@ private extension EditorScreen {
             trailingButtons: {}
         ) {
             var sheet = $0
-            sheet.colorPickers = .all
+            // Uncomment this to show all color pickers
+            // sheet.colorPickers = .allCases
             return sheet
         }
     }

Sources/RichTextKit/Colors/RichTextColor.swift

@@ -79,3 +79,8 @@ public extension RichTextColor {
         }
     }
 }
+
+public extension Collection where Element == RichTextColor {
+    
+    static var allCases: [RichTextColor] { Element.allCases }
+}