MQE-347: Use a remove tag instead of a remove attribute

- fix codesniffer error from static check

Author: imeron2433

src/Magento/FunctionalTestingFramework/Test/Config/Converter/Dom/Flat.php

@@ -73,7 +73,7 @@ public function convertXml(\DOMNode $source, $basePath = '')
         $value = [];
         /** @var \DOMNode $node */
         foreach ($source->childNodes as $node) {
-           if ($node->nodeType == XML_ELEMENT_NODE) {
+            if ($node->nodeType == XML_ELEMENT_NODE) {
                 $nodeName = $node->nodeName;
                 $nodePath = $basePath . '/' . $nodeName;
                 $arrayKeyAttribute = $this->arrayNodeConfig->getAssocArrayKeyAttribute($nodePath);