Bug 22085: fix UNIMARC default XSLT broken by Bug 14716

Bug 22085: fix UNIMARC default XSLT broken by Bug 14716

Bug 14716 added a call to encode-uri() and namespace str.  This
namespace declaration is sometimes missing in UNIMARC default XSLT
files.

This patch adds namespace declaration also where encode-uri is not used
because it may be used in the future. And those files are the base for
home made custom files.

Test plan :
1) Use a UNIMARC DB
2) Use default in all XSLT sysprefs
3) Apply patch
4) Perform a search on OPAC
5) Check display is OK
6) Click on a record for detail page
7) Check display is OK
8) Perform a search on staff interface
9) Check display is OK
10) Click on a record for detail page
11) Check display is OK

Signed-off-by: Frédéric Demians <f.demians@tamil.fr>
Signed-off-by: Julian Maurice <julian.maurice@biblibre.com>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>