Correct active page state for instance statistics

app/views/layouts/nav/_dashboard.html.haml

@@ -71,7 +71,7 @@
       = link_to admin_root_path, class: 'admin-icon qa-admin-area-link', title: _('Admin area'), aria: { label: _("Admin area") }, data: {toggle: 'tooltip', placement: 'bottom', container: 'body'} do
         = sprite_icon('admin', size: 18)
   - if can?(current_user, :read_instance_statistics)
-    = nav_link(controller: :instance_statistics) do
+    = nav_link(controller: [:conversational_development_index, :cohorts]) do
       = link_to instance_statistics_root_path, title: 'Instance statistics', aria: { label: 'Instance statistics' }, data: {toggle: 'tooltip', placement: 'bottom', container: 'body'} do
         = sprite_icon('chart', size: 18)
   - if Gitlab::Sherlock.enabled?