BaseContactList: fix leak in set_list_received
BaseContactList: fix leak in set_list_received

This function was calling dup_groups() but was not freeing the returned array
of groups.

Distrotech/telepathy-glib,Distrotech/telepathy-glib,Distrotech/telepathy-glib,Distrotech/telepathy-glib,Distrotech/telepathy-glib