Bug 15042: Barcode hbyymmincr does not work when receiving serials

Bug 15042: Barcode hbyymmincr does not work when receiving serials

To test:
- Set autoBarcode = <branchcode>yymm0001
- Make sure you have a serial that is set to "create an item record
  when receiving this serial"
- Receive an issue
- Click in the barcode field - nothing happens
- Apply patch and reload page
- Receive an issue
- Click in the barcode field - a barcode conforming to the
  hbyymmincr setting appears

Patch works as advertised.
Signed-off-by: Marc Véron <veron@veron.ch>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>