Add a short cooldown to the traitor invisability cloaker.

[Frank_Stein]

Incidentally, the cloaker only seems to work if you keep it in your hand. I played a round earlier today and lifted it off a someone who tried to get past floor flashers.

When I used it for myself, sticking it in my pocket deactivated it.

I'm not sure if that's by design, but with this nerf that makes it even harder to use, since a surprise attacker runs the risk of dropping it (as happened to that guy and me later) and also losing a freehand.