Related module preserves ordered tags option

Following b9b2747, a spec broke for related when ordered tags are in
use, since the hook for repeated calls of the macro was not maintaining
the preserve order value.

This hook pattern likely needs to be updated throughout the library now
that the `acts_as_ordered_taggable_on` exists as an alternative macro,
but I'm just fixing what broke a spec within the scope of my current
branch.

lib/acts_as_taggable_on/acts_as_taggable_on/related.rb

@@ -34,8 +34,10 @@ def find_matching_contexts_for(klass, search_context, result_context, options =
         end
       end
 
-      def acts_as_taggable_on(*args)
-        super(*args)
+      private
+
+      def taggable_on(ordered, *tag_types)
+        super(ordered, *tag_types)
         initialize_acts_as_taggable_on_related
       end
     end