ui_tests: checkbox click fix
    
    We check a box with clicking on label by default however sometimes
    when a label is too short (1-2 letters) we are hitting an issue
    that the checkbox obscures the label.
    
    https://pagure.io/freeipa/issue/7547
    
    Reviewed-By: Petr Vobornik <pvoborni@redhat.com>