QmlDesigner: Set object name to suppress warning

Without object name we get a warning when saving settings.

Change-Id: Iae6fac8fdd172ee205fd6397faa7a9ec3fa0a57f
Reviewed-by: Henning Gründl <henning.gruendl@qt.io>

src/plugins/qmldesigner/components/toolbar/toolbar.cpp

@@ -61,6 +61,7 @@ void ToolBar::create()
     //Core::ICore::statusBar()->hide();
 
     auto toolBar = new QToolBar;
+    toolBar->setObjectName("QDS-TOOLBAR");
 
     toolBar->setContextMenuPolicy(Qt::PreventContextMenu);