Add spaces after commas when serializing list values in moderation log

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: C4ptainCrunch

moderation/models.py

@@ -149,11 +149,11 @@ def track(cls, user, content_object: models.Model, values: dict[str, tuple]):
             if isinstance(old, (collections.abc.Iterable, QuerySet)) and not isinstance(  # type: ignore
                 old, str
             ):
-                old = ",".join([str(x) for x in old])  # noqa: PLW2901
+                old = ", ".join([str(x) for x in old])  # noqa: PLW2901
             if isinstance(new, (collections.abc.Iterable, QuerySet)) and not isinstance(  # type: ignore
                 new, str
             ):
-                new = ",".join([str(x) for x in new])  # noqa: PLW2901
+                new = ", ".join([str(x) for x in new])  # noqa: PLW2901
             if old != new:
                 cls.objects.create(
                     user=user,