Remove inference mode

You do not need the inference mode.
Maybe, it causes the error.

app.py

@@ -70,7 +70,6 @@ def randomize_seed_fn(seed: int, randomize_seed: bool) -> int:
 
 
 @spaces.GPU
-@torch.inference_mode()
 def generate(
     prompt: str,
     negative_prompt: str = "",