[FIX] account_check_printing: Fix xml_id not found in '_compute_check_amount_in_words'

When the model is loaded, the value of 'check_amount_in_words' is computed for each existing payment.
It could lead to a traceback if the second condition is reached referencing an xml_id that is not yet loaded.
Indeed, data are loaded after the models.

X-original-commit: a9234e7581f267c64c4bf19d93e7b6844fe4d0b4

addons/account_check_printing/models/account_payment.py

@@ -24,7 +24,7 @@ class AccountPayment(models.Model):
     @api.depends('payment_method_id', 'currency_id', 'amount')
     def _compute_check_amount_in_words(self):
         for pay in self:
-            if pay.currency_id and pay.payment_method_id == self.env.ref('account_check_printing.account_payment_method_check'):
+            if pay.currency_id and pay.payment_method_id.code == 'check_printing':
                 pay.check_amount_in_words = pay.currency_id.amount_to_text(pay.amount)
             else:
                 pay.check_amount_in_words = False