fix(order-form.js): fix order form submit

[sfmoe]

Changes

List Changes Introduced by this PR

1. fixed erroneous call to "event.value" to the correct "event.target.value"

Purpose

Order form does not submit. #1

Approach

uses the correct event.target.value property so the form submits properly.

Testing Steps

attempt to submit an order. on success order should be present in "view orders"

If this closes an issue, name it here. If it doesn't, remove this line
Closes #1