3335 替换boss复活倒计时机制，由使用本机时间修改为使用服务器时间，防止玩家在倒计时过程中修改本机时间导致倒计时表现错误。

client_Wu Xijin

2018-10-08 6cd55bf12c7eb5d05a3ddcc1d3ef1994616227cd

 System/Dungeon/DungeonBossBriefInfoBehaviour.cs

@@ -57,7 +57,7 @@
            {

                if (!bossInfo.IsBossAlive())

                {

                    m_RebornTime.Begin(bossInfo.refreshTime);

                    m_RebornTime.Begin((int)(bossInfo.refreshTime - TimeUtility.ServerNow).TotalSeconds);

                }

                else

                {

@@ -92,7 +92,7 @@
                    }

                }



                var rebornAtOnce = bossInfo.refreshTime < DateTime.Now && !isAlive;

                var rebornAtOnce = bossInfo.refreshTime < TimeUtility.ServerNow && !isAlive;



                if (rebornAtOnce)

                {