minor #14960 Cover Api steps in paying offline during checkout as guest scenario (TheMilek)

This PR was merged into the 1.13 branch.

Discussion
----------

| Q               | A                                                            |
|-----------------|--------------------------------------------------------------|
| Branch?         | 1.13 <!-- see the comment below -->                  |
| Bug fix?        | no                                                       |
| New feature?    | no                                                      |
| BC breaks?      | no                                                       |
| License         | MIT                                                          |

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Commits
-------
  Cover Api steps in paying offline during checkout as guest scenario
  [ECS] Fix

features/checkout/paying_for_order/paying_offline_during_checkout_as_guest.feature

@@ -20,9 +20,17 @@ Feature: Paying Offline during checkout as guest
         And I confirm my order
         Then I should see the thank you page
 
-    @ui
+    @ui @no-api
     Scenario: Successfully placing an order using custom locale
         Given I have product "PHP T-Shirt" in the cart
         When I proceed through checkout process in the "French (France)" locale with email "john@example.com"
         And I confirm my order
         Then I should see the thank you page in "French (France)"
+
+    @api @no-ui
+    Scenario: Successfully placing an order using custom locale
+        Given I pick up cart in the "French (France)" locale
+        And I add product "PHP T-Shirt" to the cart
+        When I proceed through checkout process
+        And I confirm my order
+        Then my order's locale should be "French (France)"

src/Sylius/Behat/Resources/config/suites/api/checkout/paying_for_order.yml

@@ -12,6 +12,7 @@ default:
                 - sylius.behat.context.transform.channel
                 - sylius.behat.context.transform.country
                 - sylius.behat.context.transform.lexical
+                - sylius.behat.context.transform.locale
                 - sylius.behat.context.transform.payment
                 - sylius.behat.context.transform.product
                 - sylius.behat.context.transform.shared_storage

src/Sylius/Component/Core/Model/Order.php

@@ -345,7 +345,7 @@ class Order extends BaseOrder implements OrderInterface
             static function (int $subtotal, OrderItemInterface $item): int {
                 return $subtotal + $item->getSubtotal();
             },
-            0
+            0,
         );
     }