Fix washed out colors on HDR

[LukeShortCloud]

[LukeShortCloud]

I originally found some hints for this here: https://github.com/ValveSoftware/gamescope/issues/1404

Tested and working on GameOS by me and @strycore

I still need to test with Steam to see how it compares.

[alkazar]

Thanks for the PR. Could you please remove all the whitespace changes?

[LukeShortCloud]

Those whitespaces changes were to make the entire script consistent. It's now tabs from top to bottom.