Don't call non-existent elements

Fixed a regression where the script tries to access elements that no longer
exist on the page, because they were replaced with others by a previous change.

src/webui/www/private/scripts/download.js

@@ -72,7 +72,6 @@ window.qBittorrent.Download = (function() {
 
                 defaultSavePath = pref.save_path;
                 $('savepath').setProperty('value', defaultSavePath);
-                $('rootFolder').checked = pref.create_subfolder_enabled;
                 $('startTorrent').checked = !pref.start_paused_enabled;
 
                 if (pref.auto_tmm_enabled == 1) {