[GAMEPLAY] Game mode lobby preferred positions not saving

These have to be re-selected every time you join a lobby. I'm assuming this is a bug, because good design would dictate that it remembers your previous settings, so you don't need four extra clicks before every match for no reason.

1. Select a game mode where preferred position is relevant.
2. Confirm, taking you to the mode lobby.
3. Observe that your preferred positions have been reset/removed.

This is reproducible 100% of the time. Tested across several matches, client restarts, and also semi-controlled tests.