[FIX] account: cherry-pick of 83f5dc8e

do not set unknow field when creating invoice

The field `reference_type` has been removed with b5bb5bd4

Adapt newly forward-ported test to not use this field.

closes odoo/odoo#30255

addons/account/tests/test_account_customer_invoice.py

@@ -158,7 +158,6 @@ class TestAccountCustomerInvoice(AccountTestUsers):
 
         invoice = self.env['account.invoice'].create(dict(
             name="Test Customer Invoice",
-            reference_type="none",
             payment_term_id=payment_term.id,
             journal_id=journalrec.id,
             partner_id=partner3.id,