turn off ads from the integrated tests

there is a popup making our integrated tests flaky, maybe these tests should really test without adverts (so we can trust them more) 

Perhaps we also need to rerun the tests (giving a result that we trust less) with ads on - tbd
`#countmein` drops the `GU_VIEW=responsive` cookie. Otherwise second page view might go to desktop (depending on which order the tests run in).