This resolves test_marketplace_search_and_install_app.py fail

http://qa-selenium.mv.mozilla.com:8080/job/b2g.inari.mozilla-b2g26_v1_2.marketplace/lastCompletedBuild/testReport/test_marketplace_search_and_install_app/TestSearchMarketplaceAndInstallApp/test_search_and_install_app/