Set default input prompt

app.py

@@ -299,7 +299,7 @@ def api_home():
 async def vton_run(
     upload_human: UploadFile = File(...),
     upload_cloth: UploadFile = File(...),
-    input_prompt: str = None,
+    input_prompt: str = "Short Sleeve Round Neck T-shirts",
     is_automaskchecked: bool = True,
     is_checked_crop: bool = True,
     denoise_steps: int = 30,