Correct keyguard occluding condition for wakeup

The commit [1] changes the usage of occludedByActivity to
mOccluded, but it missed once place for turning screen on.
Which could cause screen to not turn on while app uses
FLAG_SHOW_WHEN_LOCKED + FLAG_TURN_SCREEN_ON.

[1]: I0250025c5e0bc1c7af8c0dc978f441bfbce50326

Bug: 159821769
Bug: 348662989
Flag: EXEMPT bugfix
Test: ActivityVisibilityTests#testTurnScreenOnActivity_slowLaunch
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:e1702b54e52fc509acb08bc120603568e0dc368d)
Merged-In: Ic4e07911bc38cc010c41fd3f7d36c06cd64645c8
Change-Id: Ic4e07911bc38cc010c41fd3f7d36c06cd64645c8