Ignore configs for gamma options
The skanpagestaterc file has/had incorrect gamma values taken directly from KSaneCore. This causes BUG: 461120
Example file
Here are (just) the lines that are wrong in that file, generated by clearing such file and starting Skanpage with a scanner that presents these options.[Options For epson2:net:192.168.1.7]
blue-gamma-table=7077986:101:22060
green-gamma-table=101:0:0
red-gamma-table=7209061:6357108:6881396
That issue, for new installations, should be fixed on its 23.08 release, I think, whenever this gets released.
This just makes Skanpage ignore those values, since they are not yet adjustable from the interface.
Once they become adjustable (with !44 (merged)) this workaround will not be needed (they can be fixed by changing the option).
I didn't think of writing this before the 23.04 deadline, oh well...