ACP2E-2174: allow qty change for cart items without errors

Author: alzota

app/code/Magento/Checkout/Model/Cart.php

@@ -522,7 +522,6 @@ public function updateItems($data)
         );
 
         $qtyRecalculatedFlag = false;
-        $deferredErrors = [];
         foreach ($data as $itemId => $itemInfo) {
             $item = $this->getQuote()->getItemById($itemId);
             if (!$item) {