Remove a redundant mutex lock in logging.

Really can't see any purpose at all... Weird.

Common/LogManager.cpp

@@ -234,7 +234,6 @@ void LogManager::Log(LogTypes::LOG_LEVELS level, LogTypes::LOG_TYPE type, const
 			file = fileshort + 1;
 	}
 
-	std::lock_guard<std::mutex> lk(log_lock_);
 	GetTimeFormatted(message.timestamp);
 
 	if (hleCurrentThreadName) {

Common/LogManager.h

@@ -122,7 +122,6 @@ private:
 	RingbufferLogListener *ringLog_ = nullptr;
 	static LogManager *logManager_;  // Singleton. Ugh.
 
-	std::mutex log_lock_;
 	std::mutex listeners_lock_;
 	std::vector<LogListener*> listeners_;