fix x11 deferred renderer performance regression

src/Avalonia.X11/X11Window.cs

@@ -192,11 +192,6 @@ namespace Avalonia.X11
             if (platform.Options.UseDBusMenu)
                 NativeMenuExporter = DBusMenuExporter.TryCreate(_handle);
             NativeControlHost = new X11NativeControlHost(_platform, this);
-            DispatcherTimer.Run(() =>
-            {
-                Paint?.Invoke(default);
-                return _handle != IntPtr.Zero;
-            }, TimeSpan.FromMilliseconds(100));
             InitializeIme();
         }