Update app.py

app.py

@@ -5,9 +5,9 @@ APP_CHOICES = {
     "Advanced App": "adv_app"
 }
 
-app_choice = os.getenv("APP_CHOICE", "main_app")
+app_choice = os.getenv("APP_CHOICE", "simple_app")
 
 if app_choice == "adv_app" and os.path.exists("adv_app.py"):
     from adv_app import *
 else:
-    from main_app import *
+    from simple_app import *