Fix spelling of geoid test data file.
Fix spelling of geoid test data file.


geographiclib/geographiclib,Sciumo/GeographicLib,Sciumo/GeographicLib,Sciumo/GeographicLib,geographiclib/geographiclib,geographiclib/geographiclib,geographiclib/geographiclib,Sciumo/GeographicLib,Sciumo/GeographicLib,Sciumo/GeographicLib,Sciumo/GeographicLib,Sciumo/GeographicLib