Do not reload Permissions Hub when going back.

To solve this, I moved the call to reload the data so it does not
happen when the Fragment is re-created.  Dimply doing this caused the
loader to re-report its results (making us redraw the screen anyway),
so I stopped the loader.  That required me to make a copy of its data.

Fixes: 129429535
Test: Open Permissions Hub, click something, go back, see no reload.
Test: Open permissions Hub, open filter by permission dialog, see all
groups.

Change-Id: I3510a90f5690f58b9ba18b41b6d13c4e172bed50