Fix: e-mail with order confirmation PDF when not using EDI (RTC-39039)

If supplier does not use EDI, e-mail is sent if there is e-mail address in input in submit/resubmit modal. E-mail is not sent if input is empty.
If supplier uses EDI, and user select e-mail checkbox, it is required to enter e-mail address in input field.
In both cases, input is prefilled with e-mail address from supplier register. When resubmitting the order, input is prefilled with address previously used to send mail. If it was not sent, then prefilled with supplier e-mail address if exists.