feat: Update image type in app.py

The code changes update the image type in the `app.py` file. The `image` variable is now initialized with the `type="filepath"` parameter, allowing the user to input an image file path for refinement.

app.py

@@ -14,7 +14,7 @@ def refine_image(image, prompt, negative_prompt, num_inference_steps, guidance_s
     return image
 
 with gr.Blocks() as demo:
-    image = gr.Image()
+    image = gr.Image(type="filepath")
     prompt = gr.Textbox(lines=3, label="Prompt")
     negative_prompt = gr.Textbox(lines=3, label="Negative Prompt")
     num_inference_steps = gr.Slider(