Don't let keyguard to influence orientation when dismissing

When keyguard is being dismissed it still was overriding orientation
for the display, which caused report of wrong configuration to
activity that was becoming visible.

Bug: 66979760
Bug: 36897968
Fixes: 68131425
Test: Launch Unity 4 based game, lock and unlock screen, check UI
Test: com.android.server.wm.DisplayContentTests#testOrientationDefinedByKeyguard
Change-Id: I0a180b8e941a85ba4174a40cdec2ff0b8f3e00eb