Fix issue where unlocked content is visible during shade collapse.

Fixed by simplifying the default LS vis to be false during transition if the device is entered and true if not.

Test: atest WindowManagerLockscreenVisibilityTest
Flag: com.android.systemui.scene_container
Fixes: 438154553
Change-Id: I1265d4106208b0dcd213cd531a70b50054bc19c3