stories js var double output fix

challengeName and user are in stories/index.jade and stories/show.jade.

show.jade is only called from index.jade. This fix removes double output of those vars.

views/stories/show.jade

@@ -1,10 +1,8 @@
 .spacer
     script.
-        var challengeName = 'Camper News';
         var storyId = !{JSON.stringify(id)};
         var comments = !{JSON.stringify(comments)};
         var upVotes = !{JSON.stringify(upVotes)};
-        var user = !{JSON.stringify(user)};
         var image = !{JSON.stringify(image)};
         var hasUserVoted = !{JSON.stringify(hasUserVoted)};
     .spacer