Stop returning aliases as part of the room list. (#6970)

Author: clokep

changelog.d/6970.removal

@@ -0,0 +1 @@
+The room list endpoint no longer returns a list of aliases.

synapse/handlers/room_list.py

@@ -216,15 +216,6 @@ def build_room_entry(room):
                         direction_is_forward=False,
                     ).to_token()
 
-        for room in results:
-            # populate search result entries with additional fields, namely
-            # 'aliases'
-            room_id = room["room_id"]
-
-            aliases = yield self.store.get_aliases_for_room(room_id)
-            if aliases:
-                room["aliases"] = aliases
-
         response["chunk"] = results
 
         response["total_room_count_estimate"] = yield self.store.count_public_rooms(