rust-revlog: change default version from 2 to 1 in test builder
Version 1 is the only version we support, so it seems like the natural
choice for making it easy to create valid revlogs.
Differential Revision: https://phab.mercurial-scm.org/D12563
{
"conduit_uri": "https://phab.mercurial-scm.org/api",
"phabricator.uri": "https://phab.mercurial-scm.org/",
"repository.callsign": "HG",
"arc.land.onto.default": "@",
"base": "hg:.^"
}