add missing RecursionHelper

public/index.html

@@ -43,8 +43,8 @@
     <script src="/script/external/ui-ace.min.js"></script>
     <script src="/script/langColors.js"></script>
     
-    <script src="/script/app.js"></script>
     <script src="/script/ng-pdfviewer.min.js"></script>
+    <script src="/script/app.js"></script>
     
   </head>
   <body keypress-events class="d-flex flex-column">