Parent RegExp selector fix for sortable list

$('tr[parents*=" '+parentId+'"]'); - selects parent id 2, 2[0..9] etc. so when there are a lot of categories, sorting does not work properly.

'tr[parents~="'+parentId+'"]  - this select exact phrase selected by space or at the beggining or the end of attribute value.

http://api.jquery.com/category/selectors/attribute-selectors/