When user click on the App 'Link Tracker' , it gives one view..
Here , there is a menu 'Link Tracker' > 'Tracked Links' , which gives
the same view, so we have to remove the submenu which is 'Tracked Links'.
Indeed UTMs should be created from the front end, via promote.
Also fixed some mismatch in tracker views by correctlin setting the view_id in
mass_mailing and classic utm view.