update default model checkpoint in dropdown to "1-RF"

app.py

@@ -181,7 +181,7 @@ with gr.Blocks() as demo:
             gr.Textbox(device, label="Running device")
             dropdown_model = gr.Dropdown(
                 choices=list(model_dict.keys()),
-                value="2-RF + 4-TD",
+                value="1-RF",
                 label="Model checkpoint",
                 info="RF: rectified flow, TD: timestep distillation",
             )