Update reference-implementation/lib/ReadableStreamDefaultController.webidl

Co-authored-by: Kagami Sascha Rosylight <saschanaz@outlook.com>

Author: youennf

reference-implementation/lib/ReadableStreamDefaultController.webidl

@@ -7,6 +7,6 @@ interface ReadableStreamDefaultController {
   readonly attribute unrestricted double? desiredSize;
 
   undefined close();
-  undefined enqueue(optional any chunk, optional StructuredSerializeOptions options = { });
+  undefined enqueue(optional any chunk, optional StructuredSerializeOptions options = {});
   undefined error(optional any e);
 };