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

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 a public `.close()` method now, but it seemed it wouldn't be trivial.