Add remove border effect implementation for uwp

Align to code style

Remove comment

Fixed namespace

Fix using

When you only commit half of your changes 🤦‍♂️

Author: Alexander Witkowski

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

@@ -0,0 +1,32 @@
+using Windows.UI.Xaml;
+using Windows.UI.Xaml.Controls;
+using Xamarin.CommunityToolkit.Effects;
+using Xamarin.Forms.Platform.UWP;
+using Effects = Xamarin.CommunityToolkit.UWP.Effects;
+
+[assembly: Xamarin.Forms.ExportEffect(typeof(Effects.RemoveBorderEffect), nameof(RemoveBorderEffect))]
+
+namespace Xamarin.CommunityToolkit.UWP.Effects
+{
+	public class RemoveBorderEffect : PlatformEffect
+	{
+		Thickness oldBorderThickness;
+
+		protected override void OnAttached()
+		{
+			if (Control is Control uwpControl)
+			{
+				oldBorderThickness = uwpControl.BorderThickness;
+				uwpControl.BorderThickness = new Thickness(0.0);
+			}
+		}
+
+		protected override void OnDetached()
+		{
+			if (Control is Control uwpControl)
+			{
+				uwpControl.BorderThickness = oldBorderThickness;
+			}
+		}
+	}
+}