Fix enum variants

[sbking]

Enum variants are currently broken - this should fix them.

Example:

<a className="aria-current-page:underline" />

Currently produces:

[aria-current-page="page"].aria-current-page\:underline {
  text-decoration-line: underline;
}

With this PR:

[aria-current="page"].aria-current-page\:underline {
  text-decoration-line: underline;
}

[sbking]

@seanpdoyle Are there any changes I can make to get this PR ready for approval / merge?

[seanpdoyle]

Thank you!