QtVersionManger: Save one save()

We are saving anyway in extensionsInitialized()

Task-number: QTCREATORBUG-10455
Change-Id: I6cdc0f11a3f0f9db5061ef1c00646de4c3251d05
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>

src/plugins/qtsupport/qtversionmanager.cpp

@@ -361,7 +361,6 @@ void QtVersionManager::updateFromInstaller(bool emitSignal)
     }
     if (emitSignal)
         emit qtVersionsChanged(added, removed, changed);
-    saveQtVersions();
 }
 
 void QtVersionManager::saveQtVersions()