Breaking V2 issue: arrays appear to no longer default correctly to `[]` in json mode

[fnimick]

Example: https://stackblitz.com/edit/superforms-2-tutorial-zod-wjgax7?file=src%2Froutes%2F%2Bpage.svelte

See that the array is defined as [] in debug, but causes an error on form submission with testArray: "Required"

In the schema, adding .default([]) to the array definition fixes the problem.

[ciscoheat]

Thanks, will fix asap.