Blender Exporter: Added missing constant. See #10158

utils/exporters/blender/addons/io_three/exporter/api/constants.py

@@ -7,6 +7,7 @@ SPOT = 'SPOT'
 POINT = 'POINT'
 SUN = 'SUN'
 HEMI = 'HEMI'
+AREA = 'AREA'
 
 NO_SHADOW = 'NOSHADOW'