Show unplugged levels for user stats view for any level that's unplugged.

Show unplugged levels for user stats view for any level that's unplugged, rather than just when it's a single-level stage.
Yup. This is consistent with existing behaviour. 

> On Aug 14, 2014, at 4:49 PM, Laurel <notifications@github.com> wrote:
> 
> In app/views/shared/_user_stats.html.haml:
> 
> > +              - puzzle_outer_class = 'puzzle_outer_current'
> > +            - elsif sl.assessment
> > +              - puzzle_outer_class = 'puzzle_outer_assessment'
> > +            - else
> > +              - puzzle_outer_class = 'puzzle_outer_level'
> > +            %span{class: puzzle_outer_class}
> > +              %a{ href: link, class: "level_link#{passed ? ' level_link_done' : ''}"}
> > +                - unplugged = sl.level.unplugged?
> > +                - if unplugged
> > +                  %span.puzzle-unplugged
> > +                    =t('user_stats.classroom_activity')
> > +                - elsif ! passed
> > +                  %span.puzzle-number
> > +                    #{sl.stage_or_game_position}
> > +                - if passed
> > +                  = check_mark_html
> so if it’s unplugged and passed you get the %span.puzzle_unplugged and a check mark next to it?
> 
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