Remove captains ability to roll antag

[Drago156]

Despite popular belief, the HoS does not have greater security rank in the AI's eyes over the captain.

Well you see, actually they do. As they should and as the wiki puts it:

Technically, the HoS is below the captain in the command structure, but they have the final say on all matters of station security, especially the punishments given to criminals.

Notice most importantly the ALL part of that statement, this kind of thing is particularly important in the case of HoS vs. Captain in that some bumbling baffoon in a green armored suit can't jeopardize the station's safety if an HoS takes over for matters of station security, and it can even backfire against an antagonist captain in the specific scenario we are mentioning in that the HoS can declare the Captain a major security threat and override them.