qunit: log dir setup is already done by mw-apply-settings

The log dir is being created by the mw-apply-settings script. I moved
the chmod 777 there with https://gerrit.wikimedia.org/r/135550

Updates:

mediawiki-core-qunit
mwext-DataValues-qunit
mwext-EventLogging-qunit
mwext-GettingStarted-qunit
mwext-GuidedTour-qunit
mwext-MobileFrontend-qunit
mwext-MobileFrontend-qunit-mobile
mwext-MultimediaViewer-qunit
mwext-TemplateData-qunit
mwext-UploadWizard-qunit
mwext-VisualEditor-qunit
mwext-Wikibase-qunit

Change-Id: If95417f4b1d55d222b2cc123751da45e7b24cbd7