urlutil: remove usage of `ui.expandpath` in `get_pull_paths`
We want to deprecate `ui.expandpath` and simplify the code before adding more
complexity in the form of `[paths]` entry pointing to multiple url. So we inline
the relevant bits.
Differential Revision: https://phab.mercurial-scm.org/D10429
{
"conduit_uri": "https://phab.mercurial-scm.org/api",
"phabricator.uri": "https://phab.mercurial-scm.org/",
"repository.callsign": "HG",
"arc.land.onto.default": "@",
"base": "hg:.^"
}