Updated mediawiki/extensions
Project: mediawiki/extensions/CentralNotice  7721b32b1df7cc141fc6e5ac01fcf773b35d57f5

default to client banner choice

This is to make QUnit testing more realistic, also cos this
will be the supported default, moving forwards.

Change-Id: Ib5726ff3270e8ffbacfb048467ad6d845a63d080