修复事件中接收的 MessageContent 中, `referenceMessage` 的行为与 `reference` 不一致，会错误地获取自身消息详情而非引用消息详情的问题

[ForliyScarlet]

fix #174

需要注意的是之前的版本同样错误地将 referenceMessage 的返回值定义为了 non-null, 但是本次变更后会恢复为 nullable, 可能会由此引发源码不兼容的问题

[ForliyScarlet]

Qodana Community for JVM

It seems all right 👌

No new problems were found according to the checks applied

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