tests: Fix Qt6 qtquick tests regarding mouse grabbing not working

QtQuick tests don't work well if run after the QtWidget ones,
so change order.

src/Platform.cpp

@@ -132,13 +132,14 @@ std::vector<KDDockWidgets::FrontendType> Platform::frontendTypes()
 
 #endif
 
-#ifdef KDDW_FRONTEND_QTWIDGETS
-    types.push_back(FrontendType::QtWidgets);
-#endif
 #ifdef KDDW_FRONTEND_QTQUICK
     types.push_back(FrontendType::QtQuick);
 #endif
 
+#ifdef KDDW_FRONTEND_QTWIDGETS
+    types.push_back(FrontendType::QtWidgets);
+#endif
+
     return types;
 }