Bug 32504: Fix typo columnname in columns_settings.yml

Bug 32504: Fix typo columnname in columns_settings.yml

Trivial fix.

To reproduce:
1. Go to /cgi-bin/koha/admin/columns_settings.pl
2. Observe in the section Acquisition > Basket > Orders an empty field in the Column name, the row between fund and supplier_report rows: it was expected estimated_delivery_date value.
3. Apply the patch.
4. Restart Memcached (console: service memcached restart)
5. Reload cgi-bin/koha/admin/columns_settings.pl: that empty row now will have estimated_delivery_date value.

Signed-off-by: Laura Escamilla <laura.escamilla@bywatersolutions.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>