Remove unused embed option

Author: mateomurphy

lib/active_model/serializer/adapter/json_api.rb

@@ -124,7 +124,7 @@ def add_resource_links(attrs, serializer, options = {})
               add_link(attrs, name, association)
             end
 
-            if @options[:embed] != :ids && options[:add_included]
+            if options[:add_included]
               Array(association).each do |association|
                 add_included(name, association)
               end