Fix confirmation for registered customer

Author: anvasiliev

app/code/Magento/Newsletter/Model/Subscriber.php

@@ -417,7 +417,6 @@ public function subscribe($email)
             self::XML_PATH_CONFIRMATION_FLAG,
             \Magento\Store\Model\ScopeInterface::SCOPE_STORE
         ) == 1 ? true : false;
-        $isOwnSubscribes = false;
 
         $isSubscribeOwnEmail = $this->_customerSession->isLoggedIn()
             && $this->_customerSession->getCustomerDataObject()->getEmail() == $email;