ApnPreference: fix editing of APNs

Change-Id: Id04e8dc38f93f47c9356f3d7b67a3b13cca2dad6
Signed-off-by: Dirk Rettschlag <dirk.rettschlag@gmail.com>
Merge remote-tracking branch 'aokp/jb-mr2' into aokp-mr2