fix client typo

app.py

@@ -203,7 +203,7 @@ def generate_base(subject, setting, ):
     gr.Info("Generating story", duration=3)
     response = client.chat_completion(messages, max_tokens=2048, seed=random.randint(1, 5000))
     gr.Info("Story Generated", duration=3)
-    story = response.choices[0].content
+    story = response.choices[0].message.content
 
     play_steps_in_s = 2.0
     play_steps = int(frame_rate * play_steps_in_s)