[FIX] payment_stripe: Create stripe charge with email

- When creating a Stripe charge, we have the possibility to send the customer email.
  This is then used by Stripe to send a payment notification (receipt) to the customer.
  This was never done by Odoo, this commit introduce this feature.

OPW-1829945

addons/payment_stripe/models/payment.py

@@ -109,7 +109,7 @@ class PaymentTransactionStripe(models.Model):
     @api.multi
     def stripe_s2s_do_transaction(self, **kwargs):
         self.ensure_one()
-        result = self._create_stripe_charge(acquirer_ref=self.payment_token_id.acquirer_ref)
+        result = self._create_stripe_charge(acquirer_ref=self.payment_token_id.acquirer_ref, email=self.partner_email)
         return self._stripe_s2s_validate_tree(result)
 
     @api.model