Save the session on closing Creator while on the projects mode

Change-Id: I8a88b1faeca70fcefb3bfbfab76c4dc05f684f27
Reviewed-by: Eike Ziller <eike.ziller@nokia.com>

src/plugins/projectexplorer/projectexplorer.cpp

@@ -1414,8 +1414,6 @@ void ProjectExplorerPlugin::currentModeChanged(Core::IMode *mode, Core::IMode *o
 {
     if (mode && mode->id() == Core::Id(Core::Constants::MODE_WELCOME).toString())
         updateWelcomePage();
-    if (oldMode == d->m_projectsMode)
-        savePersistentSettings();
 }
 
 void ProjectExplorerPlugin::determineSessionToRestoreAtStartup()