fix: avoid overhead when calling MediaQuery._init() multiple times
fix: avoid overhead when calling MediaQuery._init() multiple times

This makes sure Foundation.MediaQuery.queries doesn't contain several duplicates because it gets called by many plugins.

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