(fix) completed the required modifications for XSRF in the mail module

UI/WebServerResources/js/Mailer/MailboxesController.js

@@ -22,7 +22,6 @@
     vm.saveFolder = saveFolder;
     vm.compactFolder = compactFolder;
     vm.emptyTrashFolder = emptyTrashFolder;
-    vm.exportMails = exportMails;
     vm.confirmDelete = confirmDelete;
     vm.markFolderRead = markFolderRead;
     vm.share = share;
@@ -252,10 +251,6 @@
       });
     }
 
-    function exportMails(folder) {
-      window.location.href = ApplicationBaseURL + '/' + folder.id + '/exportFolder';
-    }
-
     function confirmDelete(folder) {
       Dialog.confirm(l('Confirmation'), l('Do you really want to move this folder into the trash ?'))
         .then(function() {