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If brightness and contrast option is found, then always set it, even if it is zero

Bartosz requested to merge gang65/simple-scan:always-set-brightness-contrast into master

Without this patch, the brightness and contrast are set only if it is different than zero. It cause error, in following situation:

  • Change brightness/contrast to value different than zero
  • Start scanning. Notice that brightness/contrast has changed
  • Change brightness/contrast to zero
  • Without patch, brightness/contrast was not changed to zero

Current patch fixes that issue, and it's always set brightness/contrast.

Edited by Bartosz

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