Fix subsequent notifs appearing in the shade.

The issue here was that the row was still attached to the bubble expanded
state and there's a check in NotificationViewHiearhchchyManager that skips
adding the notif if it has a view parent.

Fix is simply to remove the row from the parent after dismissal (also
needs the change before this that moves adding the view to the expanded
state only when the bubble is expanded).

Test: manual - have a notif based bubble, dismiss it, get an update for it
               => ensure there is a notification for that update
Fixes: 127381548
Change-Id: I835528fc5af9d1afbd657258fa9f84bd9cc4b679