Bug 20893: batchRebuildItemsTables.pl has incorrect parameter

Bug 20893: batchRebuildItemsTables.pl has incorrect parameter

To test:
1 - run batchRebuildItemsTables.pl with a valid biblionumber
   perl /usr/share/koha/bin/batchRebuildItemsTables.pl --where biblio.biblionumber=38483  -c
2 - Note it says 'undefined biblionumber
3 - Apply patch
4 - Do it again
5 - It works!

Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Julian Maurice <julian.maurice@biblibre.com>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>