fix to LWOLoader.js : add suport LWO2 format

[adrs2002]

LWOLoader supports only LWO3 format.
This fix is correspondence to LWO2 format , Used in NASA's Open Model.

NASA's Open model - LWO , and github-NASA
preview sample

[mrdoob]

Thanks!

[looeee]

This is not correct, it's introduced errors when parsing LWO3 files.

webgl_loader_lwo.html

@mrdoob can you revert this?

[looeee]

@adrs2002 thanks for the contribution, but please make sure to check at least with the webgl_loader_lwo example in future.

[mrdoob]

@adrs2002 could you fix the regression with a new PR?

[mrdoob]

Before: https://threejs.org/examples/webgl_loader_lwo.html
After: https://raw.githack.com/mrdoob/three.js/dev/examples/webgl_loader_lwo.html

[adrs2002]

@looeee @mrdoob
Oh.Sorry! I make new PR ASAP!