Update LDAPManagementPage.class.php

Found a bug where DN should have been Port
Merge pull request #23 from merid14/dev-branch

Update LDAPManagementPage.class.php
Thanks merid14.

git-svn-id: https://svn.code.sf.net/p/freeghost/code/trunk@2509 71f96598-fa45-0410-b640-bcd6f8691b32
Merge svn with dev-branch
Merge master with svn
Merge master with dev-branch