xrandr: Fix showing of gamma values

After applying commit 6bf48ae8 'xrandr
--current --verbose' shows multiplicative inverses for gamma.
For example, after 'xrandr --output <output> --gamma 0.5:0.5:0.5', the
output of 'xrandr --current --verbose' will be "Gamma: 2.0:2.0:2.0"
instead of expected "Gamma: 0.5:0.5:0.5".

Amends 6bf48ae8

Signed-off-by: Ilya Pominov <ipominov@astralinux.ru>
6 jobs for fix_gamma_output in 1 minute and 33 seconds (queued for 3 seconds)
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