Don't reset the biometricUnlockState until the next time keyguard shows

Before this CL, the biometricUnlockState would almost immediately
update to NONE after WAKE_UNLOCK_PULSING, so the consumer
would never receive the WAKE_UNLOCK_PULSING state to play the
authentication success haptic.

Flag: none
Test: atest  BiometricUnlockControllerTest
Fixes: 319035806
Change-Id: I97e173ecc6ec1f391d81ce9335b844d3aef515af