glTF modifier: fixed case of raster overlays#1307

Julot94 wants to merge 2 commits into

CesiumGS:mainCesiumGS/cesium-native:mainfrom

GhisBntly:jdesreumaux/glTF_modifier-raster_overlaysGhisBntly/cesium-native:jdesreumaux/glTF_modifier-raster_overlaysCopy head branch name to clipboard