Bug 1619393 - Increase fuzz by one to allow reftest to pass on AppVey…
…or. r=Bert Differential Revision: https://phabricator.services.mozilla.com/D65513 [ghsync] From https://hg.mozilla.org/mozilla-central/rev/3c67e9f15e9361e595477f16e13e018b9aab35c0