[FIX] account_check_printing: multi payment has amount in words

In the wizard for payment several invoices with one payment, there was a
error when making the previous fix: 29c6c06de7.

The patch still worked because of a particularity of readonly and
related on account.payment but the check_amount_in_words would possibly
not be set when it should have.

opw-1839720
closes #24476

addons/account_check_printing/models/account_payment.py

@@ -35,7 +35,7 @@ class AccountRegisterPayments(models.TransientModel):
         res = super(AccountRegisterPayments, self).get_payment_vals()
         if self.payment_method_id == self.env.ref('account_check_printing.account_payment_method_check'):
             res.update({
-                'check_manual_sequencing': self.check_manual_sequencing,
+                'check_amount_in_words': self.check_amount_in_words,
             })
         return res