.arcconfig

httppeer: remove unused handler attribute

The consumer of this attribute was removed by b6bd4ee6ed85 in 2008.

Differential Revision: https://phab.mercurial-scm.org/D267

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