fix toggling off current permissions in review

The confirmPermissionsReview function currently only takes into account
changes to the new permissions section. Since permissions review shows
toggles for the current permissions, those should work too. It doesn't
necessarily need to show toggles for the current permissions but since
they're present the toggles should work to avoid misleading users into
thinking they've toggled off a permission that they haven't.

Test: Installed Firefox 10 in review permission mode and started it.
      Then updated to Firefox 18 and started it. Saw new and current
      permission cathegory.
Change-Id: I84310a1c20981a239169069a881dbb79267d784f