Fix default where clause order to work with new format

It looks like they changed the format for the ORDER where clauses. 

It used to be this:
https://github.com/funkhaus/fuxt-backend/blob/master/functions/gql-functions.php#L532-L533

But now it needs to be like this:

```
            children(
                where: {
                    orderby: { field: MENU_ORDER, order: ASC }
                }
            ) {
```