Don't show "join discord" if we know the account is already on our server

On the win/death modal, it should not have to show "join our discord" if user is logged in via Discord and if we can then see they are a member of the Openfront community server

<img width="685" height="308" alt="Image" src="https://github.com/user-attachments/assets/07550115-c095-40e8-b4b9-208186dc2621" />