Fix Rendezvous Autopilot to point at the rendezvous AP instead of docking AP.

However, since the RAP window is not public in MJ, we can't actually use it, so the button is currently a no-op.

Button state, however, should work just fine.
Merge pull request #77 from MOARdV/master

Fix Rendezvous Autopilot to point at the rendezvous AP instead of dock...