Updated mediawiki/extensions
Project: mediawiki/extensions/MobileFrontend  2031c4baaa6a05c066c613a76f236c77bb4e981c

Make search icon render okay on stable

We have no submit buttons in the header that need to be styled like
this so removing rule.

Change-Id: I036859dcfea5242e6ff9222965974a4bb20effcb