Use PROFILE_INACCESSIBLE to track locked profile

Pre-U ACTION_MANAGED_PROFILE_UNAVAILABLE broadcast meant the user was
shutting down, and could be used to track when the user can be treated
as locked. In Android U work profile in quiet mode remains running, so
to track when the user gets locked this CL swithces to
ACTION_PROFILE_INACCESSIBLE instead, which is sent when the user is shut
down.

+ formatting fix to satisfy lint

Bug: 277715473
Test: manual, with TestDPC and work contact shortcut
Change-Id: I258df006e2d87f69bbbac82d20ad72ddce625425