ci/eval: use correct maintainer and team positions

We need to pass through the maintainers and teams positions from the
original meta so pings work correctly, since check-meta clobbers the
original attribute positions in them.

Tested with `maintainers/scripts/get-maintainer-pings-between.sh` on a
handful of major packages maintained by both individuals and teams.

(cherry picked from commit 92bd743239)

ci/eval/compare/maintainers.nix

@@ -53,9 +53,7 @@ let
     // {
       # TODO: Refactor this so we can ping entire teams instead of the individual members.
       # Note that this will require keeping track of GH team IDs in "maintainers/teams.nix".
-      maintainers =
-        meta.maintainers or [ ]
-        ++ lib.flatten (map (team: team.members or [ ]) (meta.teams or [ ]));
+      maintainers = meta.maintainers or [ ];
     }
   ) attrsWithPackages;