Revert some code after adding shadowRoot technique

Author: josbeir

webroot/js/inject-iframe.js

@@ -65,11 +65,8 @@ if (elem) {
 
   const logAjaxRequest = (original) => function ajaxRequest() {
     if (this.readyState === 4 && this.getResponseHeader('X-DEBUGKIT-ID')) {
-      const newId = this.getResponseHeader('X-DEBUGKIT-ID');
-
-      window.debugKitId = newId;
       const params = {
-        requestId: newId,
+        requestId: this.getResponseHeader('X-DEBUGKIT-ID'),
         status: this.status,
         date: new Date(),
         method: this._arguments && this._arguments[0],