Fix hue-degree-notation false negatives for oklch

[romainmenke]

What minimal example or steps are needed to reproduce the bug?

a {
	color: lch(50% 50% 50);
	color: oklch(50% 50% 50);
}

What minimal configuration is needed to reproduce the bug?

{
  "rules": {
    "hue-degree-notation": "angle"
  }
}

How did you run Stylelint?

Demo

Which Stylelint-related dependencies are you using?

{
  "stylelint": "latest",
  "stylelint-config-standard": "latest"
}

What did you expect to happen?

I expected an error on oklch

What actually happened?

No error was reported

Do you have a proposal to fix the bug?

Add oklch in the same way as lch already exists today.