Show edit group option for default auto-added Focus groups

- Focus groups like "Friends", "Family", and "Coworkers" are read-only
because their titles are read-only and they cannot be deleted, but
their membership can still be editable, so show the "edit group"
option.

- Fix bug with editable Google+ circles were editable by adding a
missing dataset field

Bug: 5250453

Change-Id: I3c5590a01bf641fb22e97fdba4a4eb3c41725e6c