FIx occlusion status mismatch issue when screen turns off and on quickly

When KeyguardController detects occlude status change while the keyguard
is shown, it requests (UN)OCCLUDE app transition and PhoneWindowManager
defers committing the occlude state.

However KeyguardController and PhoneWindowManager use different
predicates to decide if keygaurd is shown or not. In case the predicates
return different value, occlude state in KeyguardController and
PhoneWindowManager remain inconsistent.

Test: manual
  1. set secure lock method (pattern)
  2. launch calculator app
  3. push power button to screen off
  4. just before the screen turns off, push power button to screen on
     again
Bug: 232002936
Change-Id: I4cd7e62e6800897cce50a5376495c499a0b9ad10