add delay to setRendering when coming back from inactive

lib/widgets/filament_widget.dart

@@ -246,6 +246,7 @@ class _SizedFilamentWidgetState extends State<_SizedFilamentWidget> {
         break;
       case AppLifecycleState.resumed:
         print("Resumed");
+        await Future.delayed(const Duration(milliseconds: 500));
         await widget.controller.setRendering(_wasRenderingOnInactive);
         break;
     }