[MERGED PR] Disables antag captains on classic

[Kotomata]

i'd love for this to go through, captain antags are wholly uninteresting and the possibility of captain antag negatively impacts captain authority and responsibility

captain should really be treated as a sec or sec-adjacent role anyway given their security access, stun-gun, being the captain of the entire station (it's their jurisdiction and responsibility), and their position in chain of command (if there's no HoS, they're functionally the head of the sec department, and on classic there tends to not be a HoS)

i think the biggest thing though is that captain is a guaranteed role, there is always a captain, and as such having the captain be (mechanically) part of sec means you will always have at least ONE trustworthy crew member on the station whose job is to handle antagonists, which would be very nice for classic given that most rounds have 0-2 security members (including det, who can roll antag lol)