Ensure we pass `opts` to change_form templates in siteconfig.
Review Request #12150 — Created March 14, 2022 and submitted
The Djblets siteconfig app builds on the admin
template, but changes to that template were made at some point which
were causing problems. Specifically, Django seems to have added the
ability to override that template on a per-app or per-model basis, but
that assumed that it was being rendered from within the admin view,
which inserted an
optsinto the render context which was the model's
_metaobject. This change adds the siteconfig's
appropriately so that Django's internal
Was able to open various settings pages in the Review Board admin UI
without it exploding.