Remove the wizard shuttle from the teleport spell (but not scroll) destinations

[Berrik]

Right now it's far too easy for a wizard to use the wiz shuttle computer to teleport to the station, do violence, then immediately poof away using the spell the moment he appears threatened. This is obnoxious, as there is no counterplay other than incapacitating the wizard before he can cast teleport. If it's restricted to the scroll, the number of times he could hit and run like this would at least be a little limited.