Fix loggroup name in NotificationController::getUsersToNotifyForEvent
Fix loggroup name in NotificationController::getUsersToNotifyForEvent

Using {closure} seems not helpful

Change-Id: I67ee2d6e48226cc079cb290ca7dd63407eb85883

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