Replace Maintenance::error calls with ::fatalError
Replace Maintenance::error calls with ::fatalError

Calling Maintenance::error() with the exit code has
been deprecated since 1.31.

Change-Id: I21d5c0a928b6e17db3239c31377e10d906ff95ca

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