Bug 7509: Added index on items itemcallnumber

Bug 7509: Added index on items itemcallnumber

Comment from Liz:
I couldn't get this update to fire - I found a small syntax error in the
updatedatabase.pl for this, which I corrected with this patch.

Functionally, all of this works as tested (once the typos were fixed), but
this probably requires another sign-off.

QA notes: rebased on latest master.  Also added index name `itemcallnumber`
to maintain consistency with all other indexes on items table.

Signed-off-by: Jared Camins-Esakov <jcamins@cpbibliography.com>
Signed-off-by: Ian Walls <koha.sekjal@gmail.com>
Signed-off-by: Paul Poulain <paul.poulain@biblibre.com>