WikimediaUI theme: Remove incorrect comments
WikimediaUI theme: Remove incorrect comments

Color explanation comments have been diverted from code,
let's remove them for accuracy.

Change-Id: I5c683073142c2d126b66f4b252eb64d3a514d066

wikimedia/oojs-ui,wikimedia/oojs-ui,wikimedia/oojs-ui,wikimedia/oojs-ui