Settings: fix quiet hours
http://jira.omnirom.org/browse/OMNI-627

Change-Id: Ica3bff10b3147120593bbe688882404625df18be
Picked from CarbonRom = https://github.com/omnirom/android_packages_apps_Settings/commit/7141b5cedbeab8b553e9b8b4f18a4ff35324e126