Updated mediawiki/extensions
Project: mediawiki/extensions/CentralNotice  4a766e262663e216cf8819f01b1fab903e9e08b9

Use correct field names with addExtensionUpdate

The second parameter to addField is the name of the field being
added.  This patch updates two of those calls to use the same
column name specified in the patch file.

This was noticed because beta labs was trying to re-apply the
patches:

https://integration.wikimedia.org/ci/view/Beta/job/beta-update-databases-eqiad/label=deployment-bastion-eqiad,wikidb=aawiki/3304/console

Change-Id: I5e453069f8edbb871a22ce3d32119a7a398246e3