Updated mediawiki/extensions
Project: mediawiki/extensions/Echo  8206dd0980ca618641d9bee6956304b5403fc48a

Disable unavailable notification checkboxes

Updates usage of HTMLCheckMatrix to match recent refactor allowing
options to be forced on or off.  Instead of hiding unavailable
checkboxes now we show them greyed out and unchangable. Depends on
https://gerrit.wikimedia.org/r/#/c/61163/ in core.
Bug: 47743

Change-Id: I9284a2ad29de654062e54a78a76c10dd49c35ed7