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Canoscan Lide 80: Grayscale scanning uses only red LED light

Performing the following command on recent Git version of sane-backends results in the scanner only using the red LED light and the resulting image being quite dark:

../bin/scanimage --format=png -y 100 --resolution=300 --calibration-file lide80.cal --expiration-time=0  \
    --mode=Gray --clear-calibration >out.png

Version of sane-backends: Git 1a2a8ee7

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