Bug 14326: XSLT Syntax error in MARC21slimOPACResults.xsl

Bug 14326: XSLT Syntax error in MARC21slimOPACResults.xsl

Test Plan:
1) Apply this patch
2) Ensure you are using the default XSLT setting for the staff and opac  record details
3) Perform an opac search check "Availability" for expected display values.
5) Note this patch corrects invalid syntax in xslt, there should be no visable changes to the results page.

Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>

Signed-off-by: Jonathan Druart <jonathan.druart@koha-community.org>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>