Direction comment should be removed

[nick-shaw]

https://github.com/ampas/aces-dev/blob/d3d4df5f0095dfa663bee768ff57c8b9135ebb05/transforms/ctl/lmt/LMT.Academy.ReferenceGamutCompress.ctl#L18

The reference to the direction runtime flag is no longer correct, since the forward and inverse LMTs have been split into separate transforms.