chore: increase mocha tests timeout
chore: increase mocha tests timeout

Some tests still take too much time depending on the browser and system on BrowserStack.

zurb/foundation,DaSchTour/foundation-sites,abdullahsalem/foundation-sites,denisahac/foundation-sites,zurb/foundation,zurb/foundation-sites,colin-marshall/foundation-sites,colin-marshall/foundation-sites,zurb/foundation-sites,zurb/foundation-sites,abdullahsalem/foundation-sites,denisahac/foundation-sites,colin-marshall/foundation-sites,zurb/foundation,denisahac/foundation-sites,DaSchTour/foundation-sites,abdullahsalem/foundation-sites