minor change to make tabs more flexible

This makes it easier to create tabs with an active tab (no need for
additional markup)

lib/tpl/dokuwiki/css/_tabs.css

@@ -76,6 +76,8 @@
 
 .dokuwiki .tabs > ul li .curid a,
 .dokuwiki .tabs > ul li .active a,
+.dokuwiki .tabs > ul li .active a,
+.dokuwiki ul.tabs li.active a,
 .dokuwiki ul.tabs li strong {
     z-index: 2;
     border-bottom-color: @ini_background_alt;