DeskClock: Fix alarm clock screen show black  when screen locked; am: 504dfe5e4b am: 5e8ac047f6 am: de55e49230 am: e8eeb03d60

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/DeskClock/+/12409395

Change-Id: Ida074e42b388b222f2421fbba3dad3837f525098