Remove unused method, replaced by a scope

Author: rosa

Diff for: app/models/solid_queue/ready_execution.rb

@@ -14,10 +14,6 @@ def claim(queue_list, limit, process_id)
         end
       end
 
-      def queued_as(queues)
-        QueueParser.new(queues, self).scoped_relation
-      end
-
       private
         def select_and_lock(queue_relation, process_id, limit)
           return [] if limit <= 0