Do not always update stripe amount with amount received on payment intent succeeded

The amount received is never updated once the payment intent has been created.
So we should update the payment amount only if the amount received is less
because the payment amount may have been already reduced by refunds.

#13355
(grafted from 68c907791977a33d228077bcf2c0f1acbb4fcb3f)

--HG--
branch : 6.0

modules/account_payment_stripe/payment.py

@@ -1290,7 +1290,8 @@ class Account(ModelSQL, ModelView):
                 Payment.proceed([payment])
             payment.stripe_captured = bool(
                 payment_intent['amount_received'])
-            payment.stripe_amount = payment_intent['amount_received']
+            if payment.stripe_amount > payment_intent['amount_received']:
+                payment.stripe_amount = payment_intent['amount_received']
             payment.save()
             if payment.amount:
                 Payment.succeed([payment])