Tests/LibWeb: Move existing XHR Text tests in under the XHR folder

Author: https://github.com/kennethmyhra
Commit: https://github.com/SerenityOS/serenity/commit/e3f5bbcbbe
Pull-request: https://github.com/SerenityOS/serenity/pull/22084

Tests/LibWeb/Text/input/XHR/XMLHttpRequest-response-empty.html

@@ -1,4 +1,4 @@
-<script src="include.js"></script>
+<script src="../include.js"></script>
 <script>
     asyncTest((done) => {
         const xhr = new XMLHttpRequest();

Tests/LibWeb/Text/input/XHR/XMLHttpRequest-responseXML-empty.html

@@ -1,4 +1,4 @@
-<script src="include.js"></script>
+<script src="../include.js"></script>
 <script>
     asyncTest((done) => {
         const xhr = new XMLHttpRequest();

Tests/LibWeb/Text/input/XHR/XMLHttpRequest-responseXML-gives-XMLDocument.html

@@ -1,4 +1,4 @@
-<script src="include.js"></script>
+<script src="../include.js"></script>
 <script>
     asyncTest((done) => {
         const xhr = new XMLHttpRequest();