Fix Blender Light Intensity for glTF Files 0

by Aaron Franke | CC0 1.0 Universal

Hack to decrease the imported light intensity when the generator string contains "Blender"

Hack to decrease the imported light intensity when the generator string contains "Blender". Does nothing for .blend imports because Godot already has a solution in place for that. The 3D model in the thumbnail is this one: https://github.com/KhronosGroup