DarkVector renders without styles

[jdlrobson]

Skin::setupSkinUserCss() has been hard deprecated after being soft deprecated in 1.35. One of the side effects of this is that if not patched the skin will render without styles in 1.36

Please see https://phabricator.wikimedia.org/T266735 for how to fix this.

[dolfinus]

Hello.

Thank you for creating this issue.

Can you please check #13 whether is correct or not?

[dolfinus]

@jdlrobson, thanks!