Fix small bug in image view_landmarks
Fix small bug in image view_landmarks

Didn't change the synatx for the fact that a landmark manager
is no longer viewable

patricksnape/menpo,grigorisg9gr/menpo,mozata/menpo,yuxiang-zhou/menpo,mozata/menpo,yuxiang-zhou/menpo,menpo/menpo,menpo/menpo,mozata/menpo,yuxiang-zhou/menpo,patricksnape/menpo,grigorisg9gr/menpo,mozata/menpo,grigorisg9gr/menpo,patricksnape/menpo,menpo/menpo