Fix higher (incorrect) ping displaying in tab when spectating.

Spectating player and alive player watching spectating player see incorrect ping,
This is a dirty fix and should be fixed properly if possible (get wrong ping due to the specttator delay being included in the timestamp and subtract it).
Note that when running local matchserver and multiple clients this can cause to show negative pings, like -5, I'm not sure what is the cause of that but I wasn't able to reproduce that with a remote matchserver.

rename isDie() to isDead() because what the heck Maiet.