fix: indent _drain_queue and _send inside Worker class

asr_agent/conversation_worker.py

@@ -667,13 +667,13 @@ class Worker:
             logger.exception("TTS failed")
 
 
-def _drain_queue(q: "asyncio.Queue") -> None:
-    """Discard any queued-but-not-yet-played TTS audio."""
-    while not q.empty():
-        try:
-            q.get_nowait()
-        except Exception:
-            break
+    def _drain_queue(q: "asyncio.Queue") -> None:
+        """Discard any queued-but-not-yet-played TTS audio."""
+        while not q.empty():
+            try:
+                q.get_nowait()
+            except Exception:
+                break
 
     async def _send(self, msg: dict):
         try: