Only control fingerprint from primary KeyguardUpdateMonitor

KeyguardUpdateMonitor is user-aware, yet there are multiple instances
(one per user). Only the first/primary KeyguardUpdateMonitor should control
Fingerprint behavior.

Bug: 123695809

Test: Fingerprint in multi-user works as expected now
Change-Id: I6a7c2529b0ba7dd6b87fa0d96205e5c582db0e92
2 files changed