QmlPuppet: Fix crash at puppet reset

Puppet cleanup was not handled properly, so derefFromEffectItem() was
not called for all objects that needed it, causing puppet to crash
at shutdown.

Fixes: QDS-3461
Change-Id: I22c0552fe1223789fa42b276ab377d4a9e929955
Reviewed-by: Mahmoud Badri <mahmoud.badri@qt.io>
Reviewed-by: Thomas Hartmann <thomas.hartmann@qt.io>

share/qtcreator/qml/qmlpuppet/qml2puppet/instances/qt5nodeinstanceserver.cpp

@@ -37,6 +37,7 @@
 #include <addimportcontainer.h>
 #include <createscenecommand.h>
 #include <reparentinstancescommand.h>
+#include <clearscenecommand.h>
 
 #include <QDebug>
 #include <QOpenGLContext>
@@ -59,7 +60,8 @@ Qt5NodeInstanceServer::Qt5NodeInstanceServer(NodeInstanceClientInterface *nodeIn
 
 Qt5NodeInstanceServer::~Qt5NodeInstanceServer()
 {
-    delete quickWindow();
+    NodeInstanceServer::clearScene({});
+    delete m_viewData.window.data();
 }
 
 QQuickView *Qt5NodeInstanceServer::quickView() const