Re-remove aliases

per matrix-org/matrix-spec-proposals#3624

Author: turt2live

synapse/handlers/room_summary.py

@@ -981,14 +981,11 @@ async def _build_room_entry(self, room_id: str, for_federation: bool) -> JsonDic
             current_state_ids[(EventTypes.Create, "")]
         )
 
-        aliases = await self._store.get_aliases_for_room(room_id)
-
         entry = {
             "room_id": stats["room_id"],
             "name": stats["name"],
             "topic": stats["topic"],
             "canonical_alias": stats["canonical_alias"],
-            "aliases": aliases,
             "num_joined_members": stats["joined_members"],
             "avatar_url": stats["avatar"],
             # plural join_rules is a documentation error but kept for historical