Remove VisualEditor's dependency on EventLogging

Thanks to change Idfdf692668d2 we no longer need to configure this, as
VisualEditor now has the ability to log events in general, which we can
bind EventLogging too (so less cruft in VisualEditor). Consequently,
these configuration options are no longer needed.

Change-Id: Ic92aa2f06fdb918448b584c0fea69a0958b45f65