Update app.py

The negative_prompt parameter is fixed

app.py

@@ -25,7 +25,7 @@ MAX_IMAGE_SIZE = 1024
 def infer(
     model_id: Optional[str] = "CompVis/stable-diffusion-v1-4",
     prompt: str,
-    negative_prompt=gr.Text(…),
+    negative_prompt=gr.Text('cat, dog'),
     seed: Optional[int] = 42,
     randomize_seed,
     width,