Fix BP face auth requiring full tap after auth

Fixes face auth in BP requiring user to lift and tap again if face auth
completes before finger.

NOTE: This version requires finger to be held down during face auth as confirmation.

Bug: 291960666
Test: atest PromptViewModelTest
Change-Id: I0a82720561a10cf79716784a34e165b86055d5bf
4 files changed