TPAC: Render record titles and authors consistently

Yamil Suarez noticed that the titles and authors in the call number
browse results page were presented differently than the regular search
results. This change removes some of the hard-coded <em> tags and "bold"
classes, in favour of new "record_author" and "record_title" CSS
classes. Now sites can simply change the CSS in one place to keep things
consistent between the two search results pages.

Signed-off-by: Dan Scott <dscott@laurentian.ca>
Signed-off-by: Yamil Suarez <yamil@yamil.com>
Signed-off-by: Ben Shum <bshum@biblio.org>