empathy-connectivity: handle changes in use_conn correctly
empathy-connectivity: handle changes in use_conn correctly

This is so that the presence chooser can get notified if use_conn
turns to false, and NM still reports us as offline, so it can become
sensitive again.

Signed-off-by: Jonny Lamb <3d1fb3642aaab2ff70e3392a5ab916bf99eed6a3@collabora.co.uk>

Distrotech/telepathy-account-widgets,GNOME/telepathy-account-widgets,GNOME/telepathy-account-widgets,GNOME/telepathy-account-widgets,Distrotech/telepathy-account-widgets