[MERGED PR] Makes security slots scale at lower population

[GuiHppn]

I like the sec pop balance, feels more fair towards the antags (even tho it makes some shifts really busy) but, and i dont know if im tripping or if this makes sense, but i particularly feel weird when i NTSC a round that has not reached max secs pop as if i was taking someone else slot who would like to join as security but wont have a slot. I think this comes from my view of the NTSC being a halfway between the hos and the rest of security, a +1 to help share the leading role/team management when the shifts get crazy. Idk, that kinda makes the NTSC sounds more like an officer then anything else. I could be tripping tho

omg i worded this so poorly