Make AdornerLayer hit-test visible

Fix #1463

src/Avalonia.Controls/Primitives/AdornerLayer.cs

@@ -21,7 +21,6 @@ namespace Avalonia.Controls.Primitives
         static AdornerLayer()
         {
             AdornedElementProperty.Changed.Subscribe(AdornedElementChanged);
-            IsHitTestVisibleProperty.OverrideDefaultValue(typeof(AdornerLayer), false);
         }
 
         public AdornerLayer()