Fix IME window pops up when unlock keyguard with fingerprint

When in KeyguardPasswordView, hide IME window manually with pressing
back key to back Keyguard view, and then unlock screen with fingerprint
will find IME window pop up suddently.

The reason is when KeyguardBouncer#hide will have a call path to pause
KeyguardPasswordView & reset the state, but in resetState() will call
IMM#showSoftInput even the password entry is invisible.

Make sure to not call IMM#showSoftInput when KeyguardPasswordView is
in pausing stage or password entry is invisible case to prevent
IME pops up in unexpected way.

Bug: 112811602
Test: manual as the issue description
Change-Id: I3c43d09d4206c48f1afcd8dad79e7978337f1b7d