main-window: port to new tp-glib account API
main-window: port to new tp-glib account API

Signed-off-by: Jonny Lamb <54cd04502facfcf96b325c60af9b1611ee761860@gnome.org>

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