[FIX] payment: display payment tokens for form acquirers

- The method `_get_available_payment_input` that returns the available
  payments acquirers and the payments tokens for a specific user never
  returns the payments tokens linked to a non s2s payment acquirers.

  This is wrong, the payments tokens should always appears no matter
  what are the acquirers' payment flow.

  The payment flow is used only to specify where the customer should
  input his credit cards details, either on Odoo or on the payment
  acquirer's website (or popup).

  Once a token is created, it is safe to process it since no credits cards
  details are stored on the Odoo database.

closes odoo/odoo#30258

addons/payment/models/payment_acquirer.py

@@ -324,7 +324,7 @@ class PaymentAcquirer(models.Model):
             'acquirers': acquirers,
             'pms': self.env['payment.token'].search([
                 ('partner_id', '=', partner.id),
-                ('acquirer_id', 'in', acquirers.filtered(lambda acq: acq.payment_flow == 's2s').ids)]),
+                ('acquirer_id', 'in', acquirers.ids)]),
         }
 
     @api.multi