[FIX] l10n_it_edi: fix bank info when credit note

Import an italian E-invoice of type TD04 (Nota di Credito).
The invoice type is marked as 'in_refund', but the bank information will
still be parsed from the contact info instead of taking the currenct
company info.
This will fail the check 'validate_partner_bank_id' and
the user will see the error 'The account selected for payment does not
belong to the same company as this invoice.'

Skipping the bank info when we have a credit note

opw-2239652

closes odoo/odoo#49825

Signed-off-by: Nicolas Martinelli (nim) <nim@odoo.com>