CSS Equalize: removed IE9 display: block (caused issues in medium view)

PR is removing the code that was added by 3be1450d as part of #1958.  The `display: block` was causing a gap in IE9's medium screen view and is not needed anymore to fix the secondary nav position.

If you want to test before merging, I've pushed the fix to my [gh-pages](http://patheard.github.io/wet-boew/demos/index-eng.html) branch.