Buffs defibrillator PNR to 5 minutes

Fixes https://github.com/tgstation/-tg-station/issues/5930

3 minutes is probably too short for this, but the ghosts being unable to be defibbed if not in body thing is completely intentional as it's nobody's fault but the corpse's. Essentially, I still think it's a good idea for defibrillation to remain optional for the dead person in question, as suddenly being thrust back into your body is a bad mechanic and pulls the free will out of this mechanic for ghosts. I know the, 'but when will you ever want to not be revived?' question is probably being asked in your head, but the same design logic follows cloning. If you stop paying attention and give up on the round after you die, to go observe or what have you, there's no reason for you to suddenly be forced into crit, only to deathgasp and disappoint/confuse the medical doctor reviving you.