Bug 14752 - (QA followup) Remove annoying modal, use dialog box instead

Bug 14752 - (QA followup) Remove annoying modal, use dialog box instead

- Uses a dialog box to warn of unique fields not copying, dialog was in
place for barcode generation so removed the extar modal completey
- Fixes a problem when barcode was undefined and autobarcode on
- deleted an extra space in Barcodes/hbymmincr.pm

Signed-off-by: sonia BOUIS <sonia.bouis@univ-lyon3.fr>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>