Fix window minimization.

A non-client click was being received after the click to minimize the window, which caused a call to `_parent->BringToFront();`, meaning the window got immediately restored. Ignore clicks when the window is minimized.

Fixes #8335

native/Avalonia.Native/src/OSX/AvnWindow.mm

@@ -440,6 +440,9 @@
         {
             case NSEventTypeLeftMouseDown:
             {
+                if ([self isMiniaturized])
+                    break;
+                
                 AvnView* view = _parent->View;
                 NSPoint windowPoint = [event locationInWindow];
                 NSPoint viewPoint = [view convertPoint:windowPoint fromView:nil];