fix(nav): clicking anywhere when the nav is hidden no longer opens the menu

It seems that on small viewports, clicking anywhere is opening the navigation menu. This should fix that.

`.wrapper` does not seem to be a documented property of https://github.com/viljamis/responsive-nav.js, but it felt less wrong than other options.

I also briefly tried to upgrade to a newer version, since they have now an open `.close()` method, but it seemed it wouldn't be trivial.