[MERGED PR] Disables antag captains on classic

[KikiMofo]

Hell no. Captain having the chance of being antag is part of the whole thing. It teaches you that you can't trust anyone not even the captain.
Security not being able to roll antag but captain and detective being able to gives a good distinction between them. Shows that captain is NOT sec and detective is also NOT sec.
Besides spawn killing is shitty in general not just because it's the captain doing it. Definitely should have been an Ahelp situation.