path: pass `path` to `peer` in mq
We directly use the `path` object to build the `peer` object.
There is one case where we don't. We should fix that at the same time as we fix
the sub-repo cases.
{
"conduit_uri": "https://phab.mercurial-scm.org/api",
"phabricator.uri": "https://phab.mercurial-scm.org/",
"repository.callsign": "HG",
"arc.land.onto.default": "@",
"base": "hg:.^"
}