Bug 10905: Author tracings incorrect when UseAuthoritiesForTracings is turned on

Quotation marks in MARC21slim2OPACDetail.xsl break author tracings in OPAC.
This patch fixes that.

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.

Regards
To+

Sponsored-by: Universidad Nacional de Cordoba

http://bugs.koha-community.org/show_bug.cgi?id=10838
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: Tomas Cohen Arazi <tomascohen@gmail.com>