Revert "SLING-11087: Fix for multiple components being fetched via JSI"

This reverts commit 531ffc153942f0e9f52f48dc3bfe9d57b65c8a64.
diff --git a/src/main/resources/generators/javascript.html b/src/main/resources/generators/javascript.html
index 4915a02..f4d8358 100755
--- a/src/main/resources/generators/javascript.html
+++ b/src/main/resources/generators/javascript.html
@@ -19,13 +19,13 @@
 <div id="${uniqueId}">
     <script type="text/javascript">
         if (window.XMLHttpRequest) {
-            let xhr = new XMLHttpRequest();
+            var xhr = new XMLHttpRequest();
             xhr.open('GET', encodeURI("${url}"));
             xhr.setRequestHeader('X-Requested-With', 'XMLHttpRequest');
             xhr.timeout = 10000;
             xhr.onload = function () {
                 if (xhr.status >= 200 && xhr.status < 300) {
-                    let elemId = document.getElementById('${uniqueId}');
+                    var elemId = document.getElementById('${uniqueId}');
                     if (elemId) elemId.innerHTML = xhr.responseText;
                 }
             };