FIX: unable to create new categories

Previous attempt at 70adb940 missed the critical "everyone" group from
staff, leading to a case where staff was no longer able to create categories

app/models/site.rb

@@ -72,9 +72,7 @@ class Site
   end
 
   def groups
-    groups = Group.visible_groups(@guardian.user)
-    groups = groups.where("automatic IS FALSE OR groups.id = #{Group::AUTO_GROUPS[:moderators]}") if !@guardian.is_staff?
-    groups
+    Group.visible_groups(@guardian.user, "name ASC", include_everyone: true)
   end
 
   def suppressed_from_latest_category_ids