Update app.py

I have modified model/street part 2

app.py

@@ -224,7 +224,7 @@ class Button:
         self.size = size
         self.text = text
 
-listImg = os.listdir('street') if os.path.exists('street') else []
+listImg = os.listdir('model/street') if os.path.exists('street') else []
 if not listImg:
     st.error("Error: 'street' directory is missing or empty. Please add background images.")
     st.stop()