Updates exit code for local boot

Use exit 1 instead of exit 0 so next device is loaded

Closes: https://github.com/netbootxyz/netboot.xyz/issues/1276

roles/netbootxyz/templates/menu/menu.ipxe.j2

@@ -104,7 +104,7 @@ goto main_menu
 
 :local
 echo Booting from local disks ...
-exit 0
+exit 1
 
 :shell
 echo Type "exit" to return to menu.