Bug 37496: Restore parameter to limit to details of one item

Bug 37496: Restore parameter to limit to details of one item

To test:
1. Find a bib record with more than one item
2. Click on the barcode of an item to show the item details page
--> The item details page shows the details of all items, though it does
    jump to the correct item
3. Apply patch
4. Reload the bib record, and click the barcode again
--> The item details page shows only the chosen item, with a link above
    to show all items

Signed-off-by: Roman Dolny <roman.dolny@jezuici.pl>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>