fix an issue with forgetting to unlock #430
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这里好像忘了放锁，可能导致系统卡住。
其中一个可能卡住的点是：由于这里没有放锁，导致check_dead_nodes卡住（拿不到replicator的锁）；但是check_dead_nodes已经在handle_stepdown_timeout持有braft::NodeImpl::_mutex。进而导致后续所有需要拿braft::NodeImpl::_mutex的地方都被卡住。整个Node不可用。