Go to group card after group editing

- Unfortunately, since we don't have support for group URIs
(to view a group, edit a group, or view the group list), we need
to determine whether we should set an activity result or
launch the GroupDetailActivity to view the group after editing
is finished.

Bug: 5042435
Change-Id: I71357dfc44f8539273e12169aeea78d80d258a06