remove duplicate menu-open class in markup

pages/layout/top-nav-sidebar.html

@@ -581,7 +581,7 @@ scratch. This page gets rid of all links and provides the needed markup only.
               </li>
             </ul>
           </li>
-          <li class="nav-item menu-open">
+          <li class="nav-item">
             <a href="#" class="nav-link">
               <i class="nav-icon far fa-plus-square"></i>
               <p>