Update chain_app.py

chain_app.py

@@ -167,8 +167,8 @@ async def on_chat_start():
                 max=2048,
                 step=64,
                 tooltip="Measured in pixels",
-        )
-        ]).send()
+            ),
+            ]).send()
 
         image = cl.Image(path='cat.png', name="result", display="inline")
         await cl.Message(