AddFolder stores wrong folder path in data-path

[JosHuybrighs]

When adding a folder the path to the new folder is not constructed correctly.
The code that is currently in master (and also in 2.4.0, which I am using) is:

var addFolder = function(parent, name) {
        var newNode = '<li class="directory collapsed"><a data-path="' + parent + name + '/" href="#">' + name + '</a><ul class="jqueryFileTree" style="display: block;"></ul></li>';
        var parentNode = $('#filetree').find('a[data-path="' + parent + '"]');
    ...

Must be:

var addFolder = function(parent, name) {
    var dataPath = parent + '/' + name;
    var newNode = '<li class="directory collapsed"><a data-path="' + dataPath + '/" href="#">' + name + '</a><ul class="jqueryFileTree" style="display: block;"></ul></li>';
    var parentNode = $('#filetree').find('a[data-path="' + parent + '"]');
    ...

Unless I'am overlooking something?

Best regards,
Jos