Fix 'configure another shelf' looping back to main menu

When configure_shelf() returned True the outer while loop re-displayed
the main menu instead of starting the next shelf cycle immediately.
Now loops directly back into configure_shelf() until the user declines.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

es24n_conf.py

@@ -40,9 +40,9 @@ def main():
 
         choice = prompt("Select [1/2/3/4]")
         if choice == "1":
+            another = True
+            while another:
                 another = configure_shelf()
-            if not another:
-                break
         elif choice == "2":
             firmware_update_workflow()
         elif choice == "3":