QmlDesigner: Fix material 2D view preview for material root components

Change-Id: I7930e5087014b47ccc054109cbb607ef9c373515
Reviewed-by: Mahmoud Badri <mahmoud.badri@qt.io>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>

share/qtcreator/qml/qmlpuppet/qml2puppet/instances/quick3dnodeinstance.h

@@ -47,6 +47,7 @@ public:
 
 protected:
     explicit Quick3DNodeInstance(QObject *node);
+    void invokeDummyViewCreate() const override;
 
 private:
     QQuick3DNode *quick3DNode() const;