Unable to open title.dat savegame

[shusaura85]

Object Editor fails to open the save game used as the title screen background game.
Logs show no error.

The title save game is using the GameStateType2 layout instead of the normal GameStateType layout

https://github.com/OpenLoco/OpenLoco/blob/d888eb6688675c44e91957f6de79cf1ab5a71f03/src/OpenLoco/include/OpenLoco/S5/S5GameState.h#L170

The save game marks these "old format" using the field GeneralState::fixFlags

https://github.com/OpenLoco/OpenLoco/blob/d888eb6688675c44e91957f6de79cf1ab5a71f03/src/OpenLoco/include/OpenLoco/S5/S5GameState.h#L119

I remember Object Editor opening the title save game before, but since at least version 5.0.1 is broken