revise app.py with 512 new tokens

app.py

@@ -102,7 +102,7 @@ Only return the transcription in Thai language."""
         with torch.no_grad():
             outputs = model.generate(
                 **inputs,
-                max_new_tokens=256,
+                max_new_tokens=512, ##256
                 do_sample=False,
                 pad_token_id=processor.tokenizer.pad_token_id
             )