Make the low population auto-shuttle unrecallable

[Haprenti]

 On the other hand sometimes a rando hops onto a lowpop round, immediately suicides and triggers the auto-shuttle, when everyone else alive still feels like carrying on.

Then make it unrecallable only if there was more than X players in the round. That way it is recallable on lowpop, not recallable after a more populated round were an antag did their job. It could still happen on low pop after a number of suicides when it reaches the unrecallable threshold, but by the time that happens you would have already some time to enjoy your low pop round anyway. Or you are unlucky and 10 people suicided in 5 min.