[FIX] account : remove QR code generation for credit note

To Reproduce
============

- enable QR code on Accounting settings
- with a customer who has a bank account create a credit note for him/her
- in other info tab, make sure that the qr code method is empty
- send or print the credit note

The Problem
===========

the qr code method field will be filled with SEPA, and a QR code will be added to the PDF

Solution
========

Generating a QR code for a credit note doesn't make any sense, so the qr code method field must be hidden
and no QR code should be generated.

opw-3010649

closes odoo/odoo#104496

Signed-off-by: William André (wan) <wan@odoo.com>