py3: use %d instead of %s when formatting an int into a bytestring
The latter wasn't noticed before since no tests exercise --confirm at all, let
alone on an existing DREV.
The former is only hit during an intermittent network issue during amending at
the end of a phabsend, so doesn't seem testable.
Differential Revision: https://phab.mercurial-scm.org/D7153
{
"conduit_uri": "https://phab.mercurial-scm.org/api",
"repository.callsign": "HG",
"arc.land.onto.default": "@",
"base": "hg:.^"
}