DeskClock: Fix alarm clock screen show black  when screen locked; am: 770f2b2aa7 am: 6015e165df am: be18acb8b5 am: 62c4639cc1 am: 0604439a17 am: 95d76fb14c

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

Change-Id: I46dc96f12a37399d69e6e33cf112f0b99d826dd0