Remove event logging for Commons CentralAuth image errors

Now userlogin.js is loaded at the top of the page to issue a redirect to
Commons as quickly as possible, so we can't assume that
mf-application.js needed for EL (getSessionId()) is loaded.

Change-Id: I60ecaacfc053167eae75b8b37a729ec43a15e265
Merge "Remove event logging for Commons CentralAuth image errors"