Fix tab toggle on activity

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

app/assets/javascripts/activities.js.coffee

@@ -12,7 +12,7 @@ class @Activities
 
 
   toggleFilter: (sender) ->
-    sender.parent().toggleClass "active"
+    sender.toggleClass "active"
     event_filters = $.cookie("event_filter")
     filter = sender.attr("id").split("_")[0]
     if event_filters