[flexiglass] SysUiState notif_expanded hydrates correctly.

Matches the old logic in NPVC that was using isFullyExpanded() &&
!mQsController.getExpanded() by adding the lockscreen scene to
Flexiglass logic.

Bug: 341445974
Test: manually verified that adb shell dumpsys activity service
com.android.systemui/.SystemUIService SysUiState shows the same
combination of flags for when a foldable device is unfolded, unlocked,
and folded shut again - which is what the attached bug is about. This CL
doesn't fix the bug but makes it match between Flexi and pre-Flexi
implementations where both now have overview_disabled|notif_expanded|keygrd_visible|awake|notif_visible
Flag: com.android.systemui.scene_container

Change-Id: Ibd136c8c1a2d0a80f826d963be3018e6f78922f5