Brig flusher improvement

[Firebarrage]

I've been playing a lot of sec today and have realized that there is an annoying problem with the way brig flushers work. When someone's time is up (Which may or may not be what you actually entered into the timer, which is a separate issue) the floor flusher briefly opens to let the brigged person out. If the person does not go into the flusher then it closes after a moment. The problem is that a lot of brigged people go AFK for a bit to wait out their sentence and manage to miss their brig window. If they miss it then they get trapped in the brig with no way out but to scream into their intercom and hope someone notices them (which rarely happens). I think we should tweak the flushers so that once they open they stay open until something gets flushed into it. This way Joe Schitt wont get stuck in the brig for 20 minutes for doing something dumb like stealing my hat.