gabble_roster_handle_add: force creation if we have a transient roster item
gabble_roster_handle_add: force creation if we have a transient roster item

Previously, we'd have failed to create a roster item for a contact with a
pending publish request, on the assumption that they were already on our
server-side roster.

mlundblad/telepathy-gabble,Ziemin/telepathy-gabble,Ziemin/telepathy-gabble,Ziemin/telepathy-gabble,jku/telepathy-gabble,mlundblad/telepathy-gabble,jku/telepathy-gabble,mlundblad/telepathy-gabble,jku/telepathy-gabble,Ziemin/telepathy-gabble