Fix face unlock confirmation button behavior to respect "always require confirmation" setting. Adjust the description of the confirmation toggle in private space face unlock settings to reflect this change. Screenshot: https://screenshot.googleplex.com/4uHfm9Z3ZE56ZaT.png Bug: 342383195 Test: Tested manually by flashing local build Change-Id: I0f742839a862fe66cacad9f5704dbe8b0df3a0c2