Bug 35283: Add missing subfields h and x to field 583 for staff XSLT

Bug 35283: Add missing subfields h and x to field 583 for staff XSLT

This change adds the missing subfields h and x to field 583 for
the detail XSLT in the staff interface.

Test plan:
0. Apply the patch and koha-plack --reload kohadev
1. Go to http://localhost:8081/cgi-bin/koha/cataloguing/addbiblio.pl?biblionumber=29
2. Click on tab "5"
3. Scroll down to 583 and click on "ACTION NOTE" to expand subfields
4. Fill in using the following example:
   583	0#$adowngraded$c19910110$hJoe Smith$otitle$xfrom secret FRD to confidential NSI
5. Click "Save"
6. Note that the "Action note" now shows "Joe Smith" and "from secret
   FRD to confidentail NSI"

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>