Fix lockout state for auto pin confirm

In Autoconfirmation, if we lockout, we want to have the backspace key
have the same behavior as the enter key. We also want to remove pin
hinting.

Fixes: 281661030
Test: autoconfirmation, long press backspace key
Test: autoconfirmation lockout and regular authenticate
Change-Id: Ia1128b9d2f98b1758b23e3a75909900810fd051a