Settings: quiet hours fixes

-the service already runs as the correct user so we
can use the simple API
-holy crap - why has nobody told me that scheduling
is completely broken :)

Change-Id: Ibb31819121099f601447a80ac937f40dfa351d8e
Merge branch 'android-4.4' of https://github.com/omnirom/android_packages_apps_Settings into android-4.4