Do not set auto_terminate twice

Author: pitr-ch

lib/concurrent-ruby/concurrent/executor/java_thread_pool_executor.rb

@@ -108,8 +108,6 @@ def ns_initialize(opts)
           queue = java.util.concurrent.LinkedBlockingQueue.new(@max_queue)
         end
 
-        self.auto_terminate = opts.fetch(:auto_terminate, true)
-
         @executor = java.util.concurrent.ThreadPoolExecutor.new(
             min_length,
             max_length,