Fix frontend_proxy jinja script in docker workers (#10783)

changelog.d/10783.bugfix

@@ -0,0 +1 @@
+Fix a bug which generated invalid homeserver config when the `frontend_proxy` worker type was passed to the Synapse Worker-based Complement image.

docker/configure_workers_and_start.py

@@ -162,7 +162,7 @@ WORKERS_CONFIG = {
         "shared_extra_conf": {},
         "worker_extra_conf": (
             "worker_main_http_uri: http://127.0.0.1:%d"
-            % (MAIN_PROCESS_HTTP_LISTENER_PORT,),
+            % (MAIN_PROCESS_HTTP_LISTENER_PORT,)
         ),
     },
 }