Fix active sessions card layout

app/views/profiles/active_sessions/_active_session.html.haml

 - is_current_session = active_session.current?(session)
-%li
+%li.list-group-item
   .pull-left.append-right-10{ data: { toggle: 'tooltip' }, title: active_session.human_device_type }
     = active_session_device_type_icon(active_session)

app/views/profiles/active_sessions/index.html.haml

@@ -10,5 +10,6 @@
   .col-lg-8
     .append-bottom-default
-      %ul.well-list
-        = render partial: 'profiles/active_sessions/active_session', collection: @sessions
+      .card.border-0
+        %ul.list-group.list-group-flush
+          = render partial: 'profiles/active_sessions/active_session', collection: @sessions