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/openttd.cpp

@@ -1960,6 +1960,8 @@ void GameLoop()
 	/* Check for UDP stuff */
 	if (_network_available) NetworkBackgroundLoop();
 
+	DebugSendRemoteMessages();
+
 	if (_networking && !HasModalProgress()) {
 		/* Multiplayer */
 		NetworkGameLoop();