LP2052960 Remove button markup from record actions

LP2052960 Remove button markup from record actions

Removes errant <button> elements that were nested inside the Patron View
and Place Hold links (in the bib record actions row of buttons below the
summary box). Buttons inside links are unnecessary and created an extra
tab stop when navigating the page via keyboard. Classes have been moved
to the <a> element to retain styling.

Release-note: Remove extra tab stops when navigating bib record actions in staff client using keyboard

Signed-off-by: Stephanie Leary <stephanie.leary@equinoxoli.org>
Signed-off-by: Galen Charlton <gmc@equinoxOLI.org>
Signed-off-by: Jane Sandberg <js7389@princeton.edu>