Revert "Run fpDetect instead of authenticate if keyguard is dismissible"

This reverts commit 0cdcacb4. This does
not remove the ACONFIG flag, but rather removes the logic associated
with the flag.

Reason for revert: UX & Product team decided this feature is undesirable
Fixes: 311145851

Change-Id: I43d2a2b71860834e5757a9356d7b4e9934c11097