Make sure to use array_values for group names in user-rights notifications
Make sure to use array_values for group names in user-rights notifications

Bug: T125279
Change-Id: I49b5fe5cf27aef5b710a5d95a064b09b08612667

wikimedia/mediawiki-extensions-Echo,wikimedia/mediawiki-extensions-Echo,wikimedia/mediawiki-extensions-Echo,wikimedia/mediawiki-extensions-Echo