test: accept metadata kwarg in Matrix streaming capture adapter (#58728)

Match main's edit_message signature so the #58728 regression keeps
exercising the progressive-edit path if the consumer passes metadata.

Co-authored-by: Kewe63 <86300262+Kewe63@users.noreply.github.com>
Co-authored-by: ZeroOttantotto <37018931+ZeroOttantotto@users.noreply.github.com>

tests/gateway/test_run_progress_topics.py

@@ -160,7 +160,7 @@ class MatrixStreamingProgressCaptureAdapter(ProgressCaptureAdapter):
         return result
 
     async def edit_message(
-        self, chat_id, message_id, content, *, finalize: bool = False
+        self, chat_id, message_id, content, *, finalize: bool = False, metadata=None
     ) -> SendResult:
         self.edits.append(
             {