MediaWiki theme: Ensure WCAG level AA contrast on unsupported SelectFileWidget
MediaWiki theme: Ensure WCAG level AA contrast on unsupported SelectFileWidget

Ensuring WCAG level AA conforming contrast on unsupported SelectFileWidget
message.

Change-Id: Iaf9fc97f13661e8160fc5348f513baf57b5b46d3

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