Unify Classic and RP Sec accesses

[Chasu]

Especially on lowpop, not being able to get into certain places is a pain. Imagine that an antag's stolen the spare, there's no AI and no scientists, and the antagonist is hiding somewhere in science. All that security can do is break in ot wait for somebody with accesd to arrive, and by the time that's done, the antag has already fled somewhere else. I don't see a real need to restrict security access on RP.