Fix sort order and filter placement (#37904)

* Move filter inside asset filter

* Change sort order

plugins/filters.rb

@@ -124,12 +124,12 @@ module Jekyll
         end
       end
     end
-  end
 
     def case_insensitive_sort(input, key)
       return input unless input.is_a?(Array)
       input.sort_by { |item| item[key].to_s.downcase }
     end
   end
+end
 
 Liquid::Template.register_filter(Jekyll::AssetFilter)