Keyguard shouldn't listen to FP if bouncer showing and keyguard dismissing

There's a race condition if user unlocks from bouncer and an app underneath
uses FP does onResume()

If a user has an application that's authenticating via FP underneath
keyguard and the user dismisses keyguard via bouncer, the app underneath
will get kicked out since onKeyguardVisibilityChanged(false) calls
shouldListenForFingerprint() during this race.

Keyguard shouldn't listen to FP if bouncer is showing but keyguard is
dismissing

Fixes: 37967985
Test: 1) open FP settings
2) enter keyguard and go to bouncer
3) unlock keyguard via pin/pattern/password (NON FP method)
4) tap any finger on sensor (should vibrate)

Merged-In: Ie38d55e6a1ec9b49f9df0c7520d0bc451315c161
Change-Id: Ie38d55e6a1ec9b49f9df0c7520d0bc451315c161