Fix "Add new being disabled"

A connection was missing, so the actions weren't updated on
closing the new dialog.

Change-Id: I3ee8c4ed3d7fc4a81dcdd067897f42ac70118b77
Task-number: QTCREATORBUG-14377
Reviewed-by: Eike Ziller <eike.ziller@theqtcompany.com>

src/plugins/projectexplorer/projectexplorer.cpp

@@ -1240,6 +1240,8 @@ bool ProjectExplorerPlugin::initialize(const QStringList &arguments, QString *er
     connect(ICore::instance(), &ICore::coreOpened,
             dd, &ProjectExplorerPluginPrivate::restoreSession);
     connect(ICore::instance(), &ICore::newItemDialogRunningChanged, updateActions);
+    connect(ICore::instance(), &ICore::newItemDialogRunningChanged,
+            dd, &ProjectExplorerPluginPrivate::updateContextMenuActions);
 
     dd->updateWelcomePage();