Revert "renderer: don't double-apply sample order"

Revert this change as it is required for interpreting bgr planes correctly.

Fixes sample generated with: ffmpeg -i -vf format=bgr0 -c:v rawvideo -y test.nut

Also fixes: https://github.com/mpv-player/mpv/issues/13398

This reverts commit 6e15daee.