Fix LockSettingsService unit test long wait

The mock fingerprint manager and face manager did not call the
removal callback, resulting in long delay in the LockSettingsService
side.

Bug: 142314731
Test: atest com.android.server.locksettings
Change-Id: I228e47c601deb90c90fd3aca3a40dbc8b22ec7e5
1 file changed