Revert order of Closed and WindowClosed events.

They were swapped in #17059 which caused problems for Outsystems. Temporarily reverting this for them until we decide what to do long-term.

Author: grokys

src/Avalonia.Controls/Window.cs

@@ -1056,10 +1056,10 @@ private protected sealed override void HandleClosed()
         {
             _shown = false;
 
-            base.HandleClosed();
-
             RaiseEvent(new RoutedEventArgs(WindowClosedEvent));
 
+            base.HandleClosed();
+
             Owner = null;
         }