[Bug] `./utilsutils.js:createBox` back `positions` typo?

[SwuduSusuwu]

After //front is all f**.
After //right is all **r.
After //back is all b** except fbr.x, bbr.y, bbr.z, (

webgl2examples/utils/utils.js

Lines 121 to 127 in ed65454

	//back
	fbr.x, bbr.y, bbr.z,
	bbl.x, bbl.y, bbl.z,
	btr.x, btr.y, btr.z,
	btr.x, btr.y, btr.z,
	bbl.x, bbl.y, bbl.z,
	btl.x, btl.y, btl.z,

) After //left is all **l.
After //top is all *t*.
After //bottom is all *b*.