Remove Security's access to the crematorium on RP

[Meggal Bozale]

I'm with this change, it's the chaplain's space and I don't see why security should have it. Honestly might as well do this on classic too, less difference in servers like that. (I don't doubt the doors would get hacked / windows smashed anyways, it's classic.)

Probably wouldn't even affect time to cremate lings/other antags, I imagine the crusher would just get used instead. Not like I like either action, but eh.