rebase: remove unnecessary '.unfiltered()' calls
Now we have a clear centric place to control whether `rbsrt.repo` is
unfiltered or not, we can drop `unfiltered()` in other places.
Differential Revision: https://phab.mercurial-scm.org/D645
{
"conduit_uri": "https://phab.mercurial-scm.org/api",
"repository.callsign": "HG",
"arc.land.onto.default": "@",
"base": "hg:.^"
}