Fix KD index typo.
Fix KD index typo.

boundlessgeo/PDAL,mtCarto/PDAL,radiantbluetechnologies/PDAL,lucadelu/PDAL,boundlessgeo/PDAL,mtCarto/PDAL,jwomeara/PDAL,mpgerlek/PDAL-old,mtCarto/PDAL,radiantbluetechnologies/PDAL,lucadelu/PDAL,Sciumo/PDAL,mpgerlek/PDAL-old,mpgerlek/PDAL-old,Sciumo/PDAL,DougFirErickson/PDAL,Sciumo/PDAL,DougFirErickson/PDAL,jwomeara/PDAL,radiantbluetechnologies/PDAL,DougFirErickson/PDAL,lucadelu/PDAL,jwomeara/PDAL,Sciumo/PDAL,mpgerlek/PDAL-old,jwomeara/PDAL,boundlessgeo/PDAL,radiantbluetechnologies/PDAL,boundlessgeo/PDAL,lucadelu/PDAL,mtCarto/PDAL,DougFirErickson/PDAL