share: stop using 'islocal' with repo instance
Having this level of polymorphism of the `islocal` function is weird, and we
already have a way to know if the repo is local from the object itself.
We are about to deprecate passing a non-bytes object to `islocal`, so clean this
up beforehand.
We might want to clean up this function too in the future, however this is
another adventure.
{
"conduit_uri": "https://phab.mercurial-scm.org/api",
"phabricator.uri": "https://phab.mercurial-scm.org/",
"repository.callsign": "HG",
"arc.land.onto.default": "@",
"base": "hg:.^"
}