remove left-over /vagrant/srv/docroot/dumps/www directory from manifest
remove left-over /vagrant/srv/docroot/dumps/www directory from manifest

We don't use it for anything.

Bug: T201478
Change-Id: I12e1c670c166c0be02b8331bb8dbd9d27a7990de

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