Set TimedMediaHandler to run composer
Set TimedMediaHandler to run composer

getid3 library is now fetched via composer, so the extension setup
needs to pull dependencies when provisioning.

Bug: T158611
Change-Id: Ie4fa70e216e3eade652c2085b247f06cdad1aa6b

wikimedia/mediawiki-vagrant,wikimedia/mediawiki-vagrant,wikimedia/mediawiki-vagrant,wikimedia/mediawiki-vagrant,wikimedia/mediawiki-vagrant,wikimedia/mediawiki-vagrant