Close navigation link in side bar is not working

[davidmurdoch]

#1382 fixes a bug in the Close Navigation link, but it causes another (less bad bug) and I found one more:

Without the above fix, on smaller screens, a Close Navigation link shows up at the bottom of the navigation. This link is (or is supposed to be) Screen Reader friendly as well as keyboard accessible. BUT:

• With the above fix the link is always hidden
• Even without the fix, the link was only visible if the top-level nav was opened, when the sub level navs are opened the link is hidden again.