remove the ability of pods to enter the escape shuttle

[Vitatroll]

The only problem I had with em' laid with being able to get a pod in by parking it where the shuttle lands,
and mining drills being easy access and more-or-less instadeath.

Both issues have been taken care of I think, so I'm fine with it as it is. I mean it doesn't make sense, and that slightly bothers me, but it's not like the station is a bastion of reason; we practically run on impossible.