[BUG] Immediate desyncs when using *_overrides_savegame_settings on a server

[Mariculous]

When a server is using any of the *_overrides_savegame_settings, any clients will desync.
This can be reproduced by, for example, setting pak_overrides_savegame_settings = 1 and hosting the demo save as a server.
Even when connecting locally from the same installation of simutrans, the client will desync quickly.