SubscribeTopicRemoveSubscribeTick 方法

减少一个订阅的计数信息，用户可以手动调用，比如判断是否是最后一次移除，然后决定是否通过 MqttClient 取消订阅主题
Reduce the count information of a subscription, the user can call it manually, such as judging whether it is the last removal, and then decide whether to unsubscribe the topic through MqttClient

public long RemoveSubscribeTick()

Public Function RemoveSubscribeTick As Long

public:
long long RemoveSubscribeTick()

member RemoveSubscribeTick : unit -> int64