Do not forget to insert the new launch option for DX12 Beta

I do not see a lot of focus or reminders on this but I do want to remind everyone that with the release of S21, and if you're on DX12 Beta version you would need to change the launch option. I see a lot of focus on the other changes and just in the event it was overlooked or forgotten.

• Changed the way players opt-in to the DX12 beta: if you're playing via the DirectX 12 beta now, the launch argument "-eac_launcher_settings SettingsDX12.json" should be changed to "-anticheat_settings=SettingsDX12.json"