Bug 13305: Remove tabindex from PrepareItemsRecordDisplay

Bug 13305: Remove tabindex from PrepareItemsRecordDisplay

Test plan:
Check the tab order of the item block on additem.pl (item editor),
Acquisition (neworderempty or addiso2709), serials-edit.pl.
You could also check services/itemrecorddisplay.pl and pass a
biblionumber; this script is used in additem.js for cataloguing and
acquisition.

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>