Fix text color usage for different visual states when using a button with character spacing

Xamarin.Forms.Platform.iOS/Renderers/ButtonLayoutManager.cs

@@ -144,6 +144,7 @@ void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e)
 			else if (e.PropertyName == Button.ImageSourceProperty.PropertyName)
 				_ = UpdateImageAsync();
 			else if (e.PropertyName == Button.TextProperty.PropertyName ||
+					 e.PropertyName == Button.TextColorProperty.PropertyName ||
 					 e.PropertyName == Button.TextTransformProperty.PropertyName ||
 					 e.PropertyName == Button.CharacterSpacingProperty.PropertyName)
 				UpdateText();