Remove unnecessary $wgExtensionFunctions

As best I can tell, adding the ext.eventLogging module as a dependency
for these three modules is unnecesary. One of those modules doesn't
even exist, and my greps across the entire extension show that
mmv.logging.Logger.js uses mw.loader.using to load the module, so a
server-side dependency isn't required.

As an aside, this extension should probably use the more abstract
mw.track interface instead.

Bug: T180192
Change-Id: If71277114be5a003d8f51040e52a601ace983c51