fix old contests interface, newInterface is now boolean
fix old contests interface, newInterface is now boolean

France-ioi/bebras-platform,France-ioi/bebras-platform,be-oi/beoi-contest-platform,France-ioi/bebras-platform,be-oi/beoi-contest-platform,France-ioi/bebras-platform,be-oi/beoi-contest-platform,be-oi/beoi-contest-platform,be-oi/beoi-contest-platform,France-ioi/bebras-platform,France-ioi/bebras-platform,be-oi/beoi-contest-platform