[FIX] payment_stripe: save token

- Configure Stripe with 'Save Cards' set to 'Let the customer decide' or
'Always'.
- Go to the eCommerce, buy an item
- Use Stripe to pay, make sure to check 'Save my payment data'

No payment token is saved.

It occurs because 2 calls are performed to `/shop/payment/transaction`.
The second call, which is used to record the transaction, doesn't
contain the `save_token` parameter is not sent.

Ideally, we should only make a single call, but since Stripe works a bit
differently, we can't prevent it (in stable, at least). Therefore, we
work around it by searching the checkbox value.

opw-2008275

closes odoo/odoo#34242

Signed-off-by: Nicolas Martinelli (nim) <nim@odoo.com>

addons/payment_stripe/static/src/js/stripe.js

@@ -105,9 +105,17 @@ odoo.define('payment_stripe.stripe', function(require) {
         var invoice_num = get_input_value("invoice_num");
         var merchant = get_input_value("merchant");
 
+        // Search if the user wants to save the credit card information
+        var form_save_token = false;
+        var acquirer_form = $('#o_payment_form_acq_' + acquirer_id);
+        if (acquirer_form.length) {
+            form_save_token = acquirer_form.find('input[name="o_payment_form_save_token"]').prop('checked');
+        }
+
         ajax.jsonRpc(payment_tx_url, 'call', {
             acquirer_id: acquirer_id,
             access_token: access_token,
+            save_token: form_save_token,
         }).then(function(data) {
             var $pay_stripe = $('#pay_stripe').detach();
             try { provider_form[0].innerHTML = data; } catch (e) {}