Call updateCoords on SkyPoint before rendering the eyepiece view

This is necessary ever since we changed the Observation Planner to use
clone SkyObjects instead of the versions in the map.

TODO: It might be better to make showEyepieceField take a const
      SkyPoint and clone it.

TODO: It would be good to show the time, date and geolocation of the
      eyepiece field view.