Don't update biometricListenState on SB stateChange

On StatusBarState change, don't immediately update
biometricListeningState or else it's possible we start face auth before
the device turns off. We rely on other signals to update the
biometricListeningState when all state (ie: dozing/sleeping) is properly
set.

This bug was introduced by ag/13020637 in a seemingly harmless small
refactor of KeyguardUpdateMonitor's mStatusBarState handling.

Test: atest KeyguardUpdateMonitorTest
Test: manual
Fixes: 187677463
Change-Id: I874273e1a5c9bd2d5e892702c4c154540cdc0a84