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genesys: Enable gamma setting when contrast or brightness is adjusted

Povilas Kanapickas requested to merge p12tic/backends:genesys-fix-contrast-brightness into master

Brightness and contrast adjustments are handled via gamma tables and thus gamma functionality is required for these settings to have any effect.

Previously if the device has a sensor with identity gamma (gamma = {1, 1, 1}), then gamma tables were turned off, consequently brightness and contrast settings had no effect.

Fixes #271 (closed).

Thank you @gunnarhj and @Stk for investigation and preliminary fixes.

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