Update --json output with new properties
Amends c891a068
Note: this is a blind fix, as I don't have an HDR capable display with me at the moment. After this is merged, I might wanna adjust zsh completions, so they check whether properties are supported (which can be detected by the presence of properties in the json output), so that completion script could hide irrelevant ones from the list of suggestions.
Edited by ivan tkachenko