fix extra bracket

app.py

@@ -70,7 +70,7 @@ def transcribe_audio_file(file_path: str) -> str:
         return json.dumps({"success": True, "transcript": transcript_data})
 
     except Exception as e:
-        return json.dumps({"success": False, "error": str(e)}})
+        return json.dumps({"success": False, "error": str(e)})
 
 
 @tool