Keep notification drawer open when undoing an action

If the notification drawer is open, and the last notification is
removed, it will close.  So instead of removing the undo notification
and adding the original notification, we keep the undo there, and
replace it with the original.

Bug: 8106230
Change-Id: I8663f717ef3bb3863a8acd0a8dbade4b3fc9cac7
1 file changed