CA-140336: Hide the Windows menu item at all times

- cannot remove completely because of the plugin specification, but it is not be visible even if they were plugins trying to use it

Signed-off-by: Mihaela Stoica <mihaela.stoica@citrix.com>
Merge pull request #138 from MihaelaStoica/CA-140336

CA-140336: Hide the Windows menu item at all times