Fix logger-based coredumps during early exits

On my linux laptop calling moonlight --help results in a crash/coredump after the help is printed.

It is caused by 00:00:00 - Qt Warning: QThreadStorage: entry 2 destroyed before end of thread 0x5555558b5c80 log entry that is being logged after atexit(SDL_Quit()); (I don't know if that's the only log).

The crash occurs here:

void logToLoggerStream(QString& message)
{
    // ... omitted

    // Strip session encryption keys and IVs from the logs
    message.replace(k_RikeyRegex, "&rikey=REDACTED");
    message.replace(k_RikeyIdRegex, "&rikeyid=REDACTED");

    // ... omitted
}

The regex backend/engine used by Qt for k_RikeyRegex is already cleaned up and causes SEGFAULT at best, in other cases the process just hangs for a minute or 2. Removing these message.replace(...) creates SEGFAULTs in other places.

This is my least invasive solution for suppressing the logging without refactoring global variables and thus preventing segfaults.