Vector: Simply style external links

These external link icons are extremely costly with little gain.
During the typography experiment, these were removed, no one
raised this as an issue during the 5  months it was live, suggesting
that explicit pdf icons etc are not as useful as we like to believe.

As a result of these findings posting this patch upstream.
Bug: 54604
Change-Id: If985b16c4f682d737683597ed80951c6d6644c8f