webui: update topology graph after raising domain level
When topology graph was shown with domain level == 0, a view describing
that domain level needs to be at least 1 was shown.
If domain level is raised, this view is then properly replaced by the
graph when shown again.
https://fedorahosted.org/freeipa/ticket/4286
Reviewed-By: Martin Babinsky <mbabinsk@redhat.com>