Prizes sometimes are not properly equipped in custom matches

[LuisMayo]

This bug actually existed in the official server too and it's caused by the game client not properly sending the selected Prize when in a custom match lobby

Check if it would be possible for it to be fixed server side by either:

• NOT sending the equiped prize on the change prize request
• Not sending it if it hasn't been changed
• Not sending if the player is in a custom lobby (that would require Rework rooms system #13 to be done)