.arcconfig

hgweb: remove unused Graph.cur property

It was introduced in 0dba955c2636, but was already unused. I missed it in
e46f0b653002.

{
    "conduit_uri": "https://phab.mercurial-scm.org/api",
    "repository.callsign": "HG",
    "arc.land.onto.default": "@",
    "base": "hg:.^"
}