adjust style

src/server/views/widget/not_creatable_content.html

@@ -13,8 +13,8 @@
   >
 
   <ul class="nav nav-tabs hidden-print">
-    <li class="grw-nav-main-left-tab active">
-      <a href="#revision-body" data-toggle="tab">
+    <li class="nav-item grw-nav-main-left-tab active">
+      <a class="nav-link active" href="#revision-body" role="tab" data-toggle="tab">
         <i class="icon-notebook"></i> List
       </a>
     </li>