[Framework] Fix item color in browser filtering menu

A recent update changed the color of the text in lists to match that of
paragraphs. An unforeseen consequence was that it made the color of list items
in browser filtering menus change as well.

assets/css/theme.css

@@ -303,6 +303,10 @@ Styles for the "current implementations" column
   margin: 0.6em;
 }
 
+[data-col|=impl] li {
+  color: inherit;
+}
+
 dl dt {
   margin-bottom: 0.3em;
   font-size: 1.1em;