add twittersetting

lib/views/admin/security.html

@@ -279,7 +279,7 @@
   </div>
 
   <script>
-    $('#generalSetting, #googleSetting, #mechanismSetting, #githubSetting').each(function() {
+    $('#generalSetting, #googleSetting, #mechanismSetting, #githubSetting, #twitterSetting').each(function() {
       $(this).submit(function()
       {
         function showMessage(formId, msg, status) {