Settings: quiet hours: force remove notification on schedule

http://jira.omnirom.org/browse/OMNI-896

This is just a workaround so that the notification
is not staying in any case.

The underlying problem is most prolly much more
serious. It looks like the service is killed for
some reason e.g. killed by android runtime

But the onDestroy method of the service is not called
else the notification would be gone

While this is not that serious for the NotificationService
it is for the SmsCallService. If this services is killed
bypass and auto-reply will no longer work

Change-Id: I18b5994e4bb7506465ed5df7b58190f6e0877397