MAGETWO-91768: Customer section not updated after subscription declined

- Fix added

Author: Yauhen_Lyskavets

app/code/Magento/Newsletter/Controller/Subscriber/Unsubscribe.php

@@ -9,8 +9,9 @@
 class Unsubscribe extends \Magento\Newsletter\Controller\Subscriber
 {
     /**
-     * Unsubscribe newsletter
-     * @return void
+     * Unsubscribe newsletter.
+     *
+     * @return \Magento\Backend\Model\View\Result\Redirect
      */
     public function execute()
     {
@@ -27,6 +28,9 @@ public function execute()
                 $this->messageManager->addException($e, __('Something went wrong while unsubscribing you.'));
             }
         }
-        $this->getResponse()->setRedirect($this->_redirect->getRedirectUrl());
+        /** @var \Magento\Backend\Model\View\Result\Redirect $redirect */
+        $redirect = $this->resultFactory->create(\Magento\Framework\Controller\ResultFactory::TYPE_REDIRECT);
+        $redirectUrl = $this->_redirect->getRedirectUrl();
+        return $redirect->setUrl($redirectUrl);
     }
 }