Examples: fix param use2DLut in 3dlut example #21613
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A typo led to the use2DLut param of the 3dlut example to be ignored. The 2d textures were never used because of a difference of case in the parameter (use2dLut vs use2DLut). It may also have caused browsers without WebGL2 support to have issue on this example.
https://raw.githack.com/kchapelier/three.js/lutexamplefix/examples/webgl_postprocessing_3dlut.html