Bit-flip: mislabel config option

[FleepS]

Fix callback cleanup order in minigame result handler

Problem

Mislabels params on bit flip minigame

game_settings.md shows:

...
exports.mgc:start_game({
    game = 'bit_flip',
    data = {
        length = 3, -- length of code sequence to solve
        timer = 30000 -- total time allowed
    }
}, function(result)
    if result.success then
        print(('Game %s completed successfully'):format(result.game))
    else
        print(('Game %s failed'):format(result.game))
    end
end)
...

yet BitFlip.js has

this.config = {
    timer: 15000,
    code_length: 8
};

Fix

Correct the names