Fix ConvertCard: clamp 'cards' parameter instead of 'card' offset field

[torbjorn]

ConvertCard clamped the offset field card (always 12) instead of its cards parameter, so the jail-card network inputs were stuck at 1.0 once set:

- float clamp = Math.Clamp(card, 0.0f, 1.0f);
+ float clamp = Math.Clamp((float)cards, 0.0f, 1.0f);

Fixes #11