Fix #9388: thread unsafe use of NetworkAdminConsole/IConsolePrint

(cherry picked from commit d7a0e80fc18b689455eaca09883fccbcc722d7e3)

# Conflicts:
#	src/debug.cpp
#	src/debug.h
#	src/table/settings/gui_settings.ini

See: https://github.com/OpenTTD/OpenTTD/pull/9456

src/debug.h

@@ -135,4 +135,7 @@ void ClearDesyncMsgLog();
 void LogDesyncMsg(std::string msg);
 char *DumpDesyncMsgLog(char *buffer, const char *last);
 
+void DebugSendRemoteMessages();
+void DebugReconsiderSendRemoteMessages();
+
 #endif /* DEBUG_H */