Bug 24423: Add biblionumber to modify items link

Bug 24423: Add biblionumber to modify items link

To test:
- Find/create a bib with at least one item
- From detail.pl, use the checkboxes in the holdings table to select one or more items
- click the "Modify Selected Items" link just above the holdings table to take your item(s) to batch modification
- Change something and click save
- Observe that the Return to the Record link points to a url without a biblionumber: "/cgi-bin/koha/catalogue/detail.pl?biblionumber="
- Apply patch
- Repeat
- The link now works!

Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: David Nind <david@davidnind.com>
Bug 24423: Fix for deletion - cleanup accidental debug inclusiopm

To test:
Repeat prior test plan with 'Delete selected'

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Joy Nelson <joy@bywatersolutions.com>