Bug 10905: fix links to author tracings when UseAuthoritiesForTracings is on

Bug 10905: fix links to author tracings when UseAuthoritiesForTracings is on

Quotation marks in MARC21slim2OPACDetail.xsl break author tracings in
OPAC.  This patch fixes that for the prog theme; the Bootstrap theme
is not affected.

To reproduce:
- Enable UseAuthoritiesForTracings
- Search in the OPAC and go to the detail page of a record that has
  links to authorities.
- Click on the magnifier icon
- You get a 404 error page.

To test the fix:
- Apply the patch
- Search in the OPAC and go to the detail page of a record that has
  links to authorities.
- Click on the magnifier icon
- You are sent to the corresponding authority record.

Sponsored-by: Universidad Nacional de Cordoba
Signed-off-by: David Noe <drnoe@bywatersolutions.com>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Passes koha-qa.pl, trivial change

Signed-off-by: Galen Charlton <gmc@esilibrary.com>
(cherry picked from commit bc7071f3705bc43878975efadd9c0c0067c6ad37)
Signed-off-by: Fridolin SOMERS <fridolin.somers@biblibre.com>