Tidy up the masked text behavior handling of text changed (#1925)

* Queue up the Text update when running on Android

* Provide a more consistent approach across all platforms

---------

Co-authored-by: Shaun Lawrence <[email protected]>

Author: bijington

src/CommunityToolkit.Maui/Behaviors/MaskedBehavior.shared.cs

@@ -104,14 +104,10 @@ static async void OnUnmaskedCharacterPropertyChanged(BindableObject bindable, ob
 
 	Task OnTextPropertyChanged(CancellationToken token)
 	{
-#if ANDROID
-		// Android does not play well when we update the Text inside the TextChanged event. Therefore if we dispatch 
-		// the mechanism of updating the Text property it solves the issue of the caret position being updated incorrectly.
-		Application.Current?.Dispatcher.Dispatch(async () => await ApplyMask(View?.Text, token));
-		return Task.CompletedTask;
-#else
-		return ApplyMask(View?.Text, token);
-#endif
+		// Android does not play well when we update the Text inside the TextChanged event. 
+		// Therefore if we dispatch the mechanism of updating the Text property it solves the issue of the caret position being updated incorrectly.
+		// https://github.com/CommunityToolkit/Maui/issues/460
+		return View?.Dispatcher.DispatchAsync(() => ApplyMask(View?.Text, token)) ?? Task.CompletedTask;
 	}
 
 	void SetMaskPositions(in string? mask)