Remove references to app-specific WockyXmppErrors
Remove references to app-specific WockyXmppErrors

These have been broken out into their own enum, where they should have
lived all along.

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