primary-download-matrix.hbs: Add focusable="false" in the SVGs. (#2569)
primary-download-matrix.hbs: Add focusable="false" in the SVGs. (#2569)

This is to prevent IE making the focusable.
nodejs/new.nodejs.org,phillipj/new.nodejs.org,nodejs/new.nodejs.org,phillipj/new.nodejs.org