Add a short cooldown to the traitor invisability cloaker.

[Zafhset]

This feels like an unnecessary nerf based on the way one round played out - I rarely ever see cloakers (hah, geddit?) being used nowadays, so it's definitely not a case of people running it into the ground by repeating this pen/cloaker combo thing.

If the nerf is going to stick, I would suggest a further decrease in cloaker cost.