#4008 Fix ui is not showup on windows after start Wox

Wox.UI.Flutter/wox/lib/modules/launcher/wox_launcher_controller.dart

@@ -91,6 +91,11 @@ class WoxLauncherController extends GetxController implements WoxLauncherInterfa
       await windowManager.setPosition(Offset(params.position.x.toDouble(), params.position.y.toDouble()));
     }
     await windowManager.show();
+    if(Platform.isWindows) {
+      // on windows, it is somehow necessary to invoke show twice to make the window show
+      // otherwise, the window will not show up if it is the first time to invoke showApp
+      await windowManager.show();
+    }
     await windowManager.focus();
     queryBoxFocusNode.requestFocus();