[IMP]account_refund_linked_invoice: improve dictionary value update as coding standard

Author: probusedev

Diff for: account_refund_linked_invoice/models/account_invoice.py

@@ -47,5 +47,5 @@ def _prepare_refund(self, invoice,
             date=date, period_id=period_id,
             description=description, journal_id=journal_id
             )
-        res['origin_invoice_id'] = invoice.id
+        res.update(origin_invoice_id=invoice.id)
         return res