Revert "AdEngine2: disable oasis group (adengine2_js) if wgShowAds===false (ads disabled results in ads js files not loaded)"

This reverts commit c84e281796bcd3656c2a1b1d0cef0eaec8b50429.
BugId:95125 - Don't load Liftium config when not needed
Merge pull request #321 from Wikia/bug-95125-dont-load-liftium-config-when-not-needed

BugId:95125 - Don't load Liftium config when not needed