Echo: Remove redundant cast
Echo: Remove redundant cast

User::getId() is typehinted to return int and so this cast is causing
Phan failure.

Note the method is deprecated but this patch is not meant to fix that.

Change-Id: I3b7ad419d7c28c3ad7144b8005f2fa387af58b0d

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