ENGCOM-2318: GraphQL-116: Wrong category table name resolving #119

 - Merge Pull Request magento/graphql-ce#119 from magento/graphql-ce:GRAPHQL-116
 - Merged commits:
   1. 4a4bbe2

app/code/Magento/CatalogGraphQl/Model/Category/LevelCalculator.php

@@ -37,7 +37,7 @@ public function calculate(int $rootCategoryId) : int
     {
         $connection = $this->resourceConnection->getConnection();
         $select = $connection->select()
-            ->from($connection->getTableName('catalog_category_entity'), 'level')
+            ->from($this->resourceConnection->getTableName('catalog_category_entity'), 'level')
             ->where($this->resourceCategory->getLinkField() . " = ?", $rootCategoryId);
         return (int) $connection->fetchOne($select);
     }