visited purple link show be white on .active items

[cfarquharson]

The .active class on the list-group should have white text, not purple. I assume it's the :visited colour http://wet-boew.github.io/wet-boew-styleguide/v4/design/index-en.html

[cfarquharson]

Opened in WET core instead https://github.com/wet-boew/wet-boew/issues/5043