magento/graphql-ce#948 - Move preference for ErrorHandlerInterface

Author: vpodorozh

app/etc/di.xml

@@ -1781,4 +1781,5 @@
     <type name="Magento\Framework\DB\Adapter\AdapterInterface">
         <plugin name="execute_commit_callbacks" type="Magento\Framework\Model\ExecuteCommitCallbacks" />
     </type>
+    <preference for="Magento\Framework\GraphQl\Query\ErrorHandlerInterface" type="Magento\Framework\GraphQl\Query\ErrorHandler"/>
 </config>