♻️(backend) update the payment debug view with credit card

Update the line of code where we create the credit card
in the debug view of a payment.

src/backend/joanie/debug/views.py

@@ -545,7 +545,7 @@ def get_context_data(self, **kwargs):
             course=order.course,
             is_graded=True,
         )
-        credit_card = CreditCardFactory(owner=owner)
+        credit_card = CreditCardFactory(owners=[owner])
         order.init_flow(billing_address=BillingAddressDictFactory())
         billing_address = order.main_invoice.recipient_address
         one_click = "one-click" in self.request.GET