Request: add option to preserve gamma corrections

[interj]

Hi, in Redshift 1.11 an option was added to take current gamma correction into account: https://github.com/jonls/redshift/releases It's not that greatly documented, but it works just right and fixes problem of ignored color profiles. It's invoked as additional parameter passed with correction mode setting: redshift -m randr:preserve=1. My request is to allow plasmoid to start redshift with this parameter, because currently widget is unusable when custom screen color profiles are configured.

[simgunz]

I can add it.