Reshow glanceable hub after exiting the edit mode

- Lock the device to reshow glanceable hub after exiting the edit
  mode as users are asked to unlock the device before entering edit
  mode. And as we are on Communal scene already, there is no need
  to do scene transition.
- Fixed a bug in CommunalContainer that currentScene always remains
  as Blank scene. It solves that scene transition layout not actually
  showing the updated disired scene from the viewModel.

Bug: b/315154364
Test: manually
Flag: ACONFIG com.android.systemui.communal_hub DEVELOPMENT
Change-Id: I6f97521aa149e93ec054d5caac565d27577a4add