Editor Theme: Light does not show folder color about huefolders

[NullTale]

That's actually how it's meant to be done). Didn't want to support light theme because it has its own nuances and few people use it. Also colors look different in it. But if someone needs it, then why not. And indeed it looks strange that it just does not work without reporting anything.

Made an option to adjust the gradient, but in the light theme still have their own unsolvable visual problems but it does not seem critical.

Uglyness demonstration