Allow stripe refund to transition from succeeded to failed

For asynchronous charge the refund may fail after being succeeded.

#13355
(grafted from 7e6e4b67e5284df713a1022cba6a457d88e7e281)

--HG--
branch : 6.0

modules/account_payment_stripe/payment.py

@@ -814,6 +814,7 @@ class Refund(Workflow, ModelSQL, ModelView):
                 ('approved', 'processing'),
                 ('processing', 'succeeded'),
                 ('processing', 'failed'),
+                ('succeeded', 'failed'),
                 ('approved', 'draft'),
                 ))
         cls._buttons.update({