Remove redundant check
Remove redundant check

$wgEchoNotifications is checked inside EchoEvent::create(). Similar
code (e.g. onRollbackComplete() in this file) does not check it.

Change-Id: I2be05ae182c3fd5d90b87e9579f8c2aa6b79c655

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