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genesys: Various fixes for GL841 scanners

Povilas Kanapickas requested to merge p12tic/backends:genesys-gl841-fixes into master

This MR implements the following fixes and improvements:

  • Fixed issue of motor becoming stuck at certain resolutions on Canon LiDE 50 and possibly other gl841 scanners (#357 (closed))
  • Fixed incorrect LED exposure calculation leading to wrong color balance on certain resolutions on gl841 scanners
  • Fixed gray scans to use white color for illumination instead of red on Canon LiDE 35/40/50/60 and potentially other gl841 scanners. Old behavior can be restored via the color filter setting to select specific color component for the gray scan.
  • Fixed periodic black lines in gray scans on Canon LiDE 80.
  • Improved scan quality on Canon LiDE 35/40/50/60 by using brighter LED illumination.

Fixes #357 (closed).

Edited by Povilas Kanapickas

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