Bug 11175: (QA follow-up) Do not fetch twice

Bug 11175: (QA follow-up) Do not fetch twice

We were fetching components in the first call of XSLTParse4Display
(opac-detail around L220). And again (opac-detail around L660).
Same for catalogue/detail.pl.
Moving the XSLT block in both scripts and removing the code from
XSLT.pm which again makes the tests obsolete.

Not hiding the link when there are components. Might be helpful too.

Also fixing biblionumber in the XSLTParse4Display call for parts.

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>