Fix using

When you only commit half of your changes 🤦‍♂️

Author: Alex-Witkowski

src/CommunityToolkit/Xamarin.CommunityToolkit/Effects/RemoveBorder/RemoveBorderEffect.uwp.cs

@@ -2,7 +2,7 @@
 using Windows.UI.Xaml.Controls;
 using Xamarin.CommunityToolkit.Effects;
 using Xamarin.Forms.Platform.UWP;
-using Effects = Xamarin.CommunityToolkit.Android.Effects;
+using Effects = Xamarin.CommunityToolkit.UWP.Effects;
 
 [assembly: Xamarin.Forms.ExportEffect(typeof(Effects.RemoveBorderEffect), nameof(RemoveBorderEffect))]