Gate face auth on display off in the face auth refactor

Already fixed when the face auth refactor is not enabled.

Test: cover the proximity sensor when in a phone call to turn the
display off. see logs that face auth will immediately end.
Test: atest DeviceEntryFaceAuthRepositoryTest DeviceEntryFaceAuthRepositoryTest
Fixes: 294409678

Change-Id: I17289a4508b3a9cda100bb2e6a066f501ea5407c