Update job name to match $wgJobClasses key
Update job name to match $wgJobClasses key

The key must match what is specified in the constructor of the
EchoNotificationDeleteJob.

The job specify their name in the constructor through __CLASS__, which
means that with the class rename this key also needs to be updated.

Bug: T322342
Change-Id: Id1eebb0cc3ddcdabe31c5531cd32f032ed52a69c

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