fix coding-standard

Author: Franciscof-Serfe

app/code/Magento/Backend/Controller/Adminhtml/System/Account/Save.php

@@ -11,11 +11,11 @@
 use Magento\Framework\Controller\ResultFactory;
 use Magento\Framework\Exception\State\UserLockedException;
 use Magento\Security\Model\SecurityCookie;
-
+use Magento\Framework\App\Action\HttpPostActionInterface;
 /**
  * @SuppressWarnings(PHPMD.CouplingBetweenObjects)
  */
-class Save extends \Magento\Backend\Controller\Adminhtml\System\Account
+class Save extends \Magento\Backend\Controller\Adminhtml\System\Account implements HttpPostActionInterface
 {
     /**
      * @var SecurityCookie