tests: Fix memory leak of dbus connection
tests: Fix memory leak of dbus connection

https://bugzilla.gnome.org/show_bug.cgi?id=636258#c3

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