[FIX] payment_mercadopago: prevent re-send of mail when pending for payment

[ALopez-Adhoc]

No description provided.

[roboadhoc]

Pull request status dashboard.

[maq-adhoc]

podemos agregar esto para evitar el primer envio de el emal

`

class PaymentTransaction(models.Model):
_inherit = 'payment.transaction'

def _set_transaction_pending(self):
    tx_mercadopago = self.filtered(lambda t: t.aquirer_id.provider == 'mercadopago')
    if tx_mercadopago:         
        super(PaymentTransaction, tx_mercadopago.with_context(ingnore_confirmation_mail=True))._set_transaction_pending()

    super(PaymentTransaction, (self - tx_mercadopago))._set_transaction_pending()

class SaleOrder(models.Model):
_name = "sale.order"

def _send_order_confirmation_mail(self):
    if not self._context.get('ingnore_confirmation_mail'):
        super()._send_order_confirmation_mail()

`