Update app.py to use proper pipeline

app.py

@@ -1,6 +1,8 @@
 import gradio as gr
 from transformers import pipeline
 
+pipeline = pipeline(task="image-classification", model="julien-c/hotdog-not-hotdog")
+
 def predict(input_img):
     predictions = pipeline(input_img)
     return input_img, {p["label"]: p["score"] for p in predictions}