.arcconfig

windows: avoid a bytes vs unicode crash reading passwords on py2

This broke in 5b3513177f2b.  Specifically, after typing in the password on py2,
it would crash with:

    TypeError: putwch() argument 1 must be cannot convert raw buffers, not str

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