Fix an issue with item list view icon labels (including Differential date updated times) not appearing in the UI

Summary: In D19855, I removed a no-longer-necessary link around icons in some cases, but incorrectly discarded labels in other cases. Restore labels.

Test Plan: Viewed Differential revision list, saw date stamps again.

Reviewers: amckinley

Reviewed By: amckinley

Differential Revision: https://secure.phabricator.com/D19871