Update app.py

Updated the IP address of the backend

app.py

@@ -775,7 +775,7 @@ def build_demo(models):
 
 if __name__ == "__main__":
 
-    controller_url = "http://198.175.88.30:80"
+    controller_url = "http://35.226.142.233:80"
     host = "0.0.0.0"
 
     concurrency_count = 10