Refactor var to let/const or this

src/webui/www/private/upload.html

@@ -127,7 +127,7 @@
     <script>
         'use strict';
 
-        var submitted = false;
+        let submitted = false;
 
         $('uploadForm').addEventListener("submit", function() {
             $('startTorrentHidden').value = $('startTorrent').checked ? 'false' : 'true';