Bug 25248: (bug 23463 follow-up) Item is returned if deletion successful, not 1

Bug 25248: (bug 23463 follow-up) Item is returned if deletion successful, not 1

To test:
1 - Have a record with some items
2 - Click 'Delete all' under 'Edit'
3 - Confirm deletion
4 - Note you are redirected to additem.pl
5 - Add an item
6 - Apply patch
7 - Delete all items again
8 - Note you are redirected to detail.pl

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>