stream-clone-test: simplify the --uncompressed alias check
To check that --uncompressed is an alias we just need to check it trigger a
stream clone, we don't need to check anything else.
{
"conduit_uri": "https://phab.mercurial-scm.org/api",
"phabricator.uri": "https://phab.mercurial-scm.org/",
"repository.callsign": "HG",
"arc.land.onto.default": "@",
"base": "hg:.^"
}