Pass the origin when calculating the spaces summary over GET. (#10079)

Fixes a bug due to conflicting PRs which were merged. (One added a new caller to
a method, the other added a new parameter to the same method.)

changelog.d/10079.bugfix

+Fix a bug introduced in v1.35.0rc1 when calling the spaces summary API via a GET request.

synapse/federation/transport/server.py

@@ -1398,7 +1398,7 @@ class FederationSpaceSummaryServlet(BaseFederationServlet):
                 )
 
         return 200, await self.handler.federation_space_summary(
-            room_id, suggested_only, max_rooms_per_space, exclude_rooms
+            origin, room_id, suggested_only, max_rooms_per_space, exclude_rooms
         )
 
     # TODO When switching to the stable endpoint, remove the POST handler.