QmlDesigner: Update 3d user bundle imported state on load

Change-Id: I8df19486523cfd25db832ed78f0792095548dfea
Reviewed-by: Miikka Heikkinen <miikka.heikkinen@qt.io>
Reviewed-by: Qt CI Patch Build Bot <ci_patchbuild_bot@qt.io>

src/plugins/qmldesigner/components/contentlibrary/contentlibraryview.cpp

@@ -265,6 +265,7 @@ void ContentLibraryView::modelAttached(Model *model)
     m_widget->updateImportedState(compUtils.materialsBundleId());
     m_widget->updateImportedState(compUtils.effectsBundleId());
     m_widget->updateImportedState(compUtils.userMaterialsBundleId());
+    m_widget->updateImportedState(compUtils.user3DBundleId());
 }
 
 void ContentLibraryView::modelAboutToBeDetached(Model *model)