rust-status: check for '.hg' regardless of file type (issue6300)
'.hg' would show up in `hg status` if were a symlink.
Differential Revision: https://phab.mercurial-scm.org/D8461
{
"conduit_uri": "https://phab.mercurial-scm.org/api",
"phabricator.uri": "https://phab.mercurial-scm.org/",
"repository.callsign": "HG",
"arc.land.onto.default": "@",
"base": "hg:.^"
}