debugindex: align column name on the right
It will be simpler to align everything on the same side, and the right seems a
better side as it match the value alignment.
{
"conduit_uri": "https://phab.mercurial-scm.org/api",
"phabricator.uri": "https://phab.mercurial-scm.org/",
"repository.callsign": "HG",
"arc.land.onto.default": "@",
"base": "hg:.^"
}