退出前结束 ThreadLogin 和 ThreadCheckUpdate 线程

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避免 qthread destroyed while thread is still running.

[pzhlkj6612]

https://github.com/Beslyric-for-X/Beslyric-for-X/blob/0dee64a8834f1ba294b12f99fee97acc438ee500/StackFrame.cpp#L41-L44

由以下资料和现有代码逻辑得出，我写的这两个QThread::exit(int)方法在这里是没用的：

• c++ - Does QThread::quit() immediately end the thread or does it wait until returning to the event loop? - Stack Overflow
• void QThread::exit(int returnCode = 0) # QThread Class | Qt Core 5.13.2

之后试试QEventLoop，看看这东西究竟怎么用；或者干脆就在QThread::wait()之前做一些处理（例如结束网络通信），真正实现线程的“立即结束”。