Nest li elements directly under ul

app/views/admin/background_jobs/_head.html.haml

-%ul.nav-links.sub-nav
-  %div{ class: (container_class) }
+.nav-links.sub-nav
+  %ul{ class: (container_class) }
     = nav_link(controller: :background_jobs) do
       = link_to admin_background_jobs_path, title: 'Background Jobs' do
         %span

app/views/admin/dashboard/_head.html.haml

-%ul.nav-links.sub-nav
-  %div{ class: (container_class) }
+.nav-links.sub-nav
+  %ul{ class: (container_class) }
     = nav_link(controller: :dashboard, html_options: {class: 'home'}) do
       = link_to admin_root_path, title: 'Overview' do
         %span