DeskClock: Fix alarm clock screen show black  when screen locked; am: 770f2b2aa7 am: 6015e165df am: be18acb8b5 am: 62c4639cc1 am: 0604439a17

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/DeskClock/+/12137075

Change-Id: I62a43f5c0829a124939d1a99ca9fa9df7c93c3b6