Bug 9804 - Fix name for NORMARC biblio-koha-indexdefs.xml

Bug 9804 - Fix name for NORMARC biblio-koha-indexdefs.xml

When i did bug 8805, I gave the biblio-koha-indexdefs.xml file the
wrong name, and called it biblio-zebra-indexdefs.xml. This patch
fixes that.

To reproduce:
- Check that etc/zebradb/marc_defs/normarc/biblios/biblio-zebra-
  indexdefs.xml exists

To test:
- Apply the patch and check that etc/zebradb/marc_defs/normarc/
  biblios/biblio-zebra-indexdefs.xml no longer exists, but that
  etc/zebradb/marc_defs/normarc/biblios/biblio-koha-indexdefs.xml
  does exist.

Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>
Signed-off-by: Jonathan Druart <jonathan.druart@biblibre.com>
Signed-off-by: Jared Camins-Esakov <jcamins@cpbibliography.com>