[Backport] Issue #2583: Use us.is_closed instead us.status.is_closed in US detail page

app/coffee/modules/issues/detail.coffee

@@ -159,8 +159,11 @@ IssueStatusDisplayDirective = ($template)->
 
     link = ($scope, $el, $attrs) ->
         render = (issue) ->
+            status = $scope.statusById[issue.status]
+
             html = template({
-                status: $scope.statusById[issue.status]
+                is_closed: status.is_closed
+                status: status
             })
             $el.html(html)
 

app/coffee/modules/tasks/detail.coffee

@@ -159,8 +159,11 @@ TaskStatusDisplayDirective = ($template) ->
 
     link = ($scope, $el, $attrs) ->
         render = (task) ->
+            status =  $scope.statusById[task.status]
+
             html = template({
-                status: $scope.statusById[task.status]
+                is_closed: status.is_closed
+                status: status
             })
             $el.html(html)
 

app/partials/common/components/status-display.jade

@@ -1,5 +1,5 @@
 span
-    <% if (status.is_closed) { %>
+    <% if (is_closed) { %>
     | Closed
     <% } else { %>
     | Open