fixed full sync notification for some circumstances:
- make sure to delete the notification in the notification bar even if the full sync failed
- Apparently getRecords() is called twice after first init: by Home.onResume() and Home.fragmentReady() (which calles synctask()). This is no problem since the call from onResume() will only return an empty list but led to a reset of the forceSyncBool-variable in ItemGridFragment, so the notification was not shown and the crouton not displayed after login.