Fix WorldPay AVS settings to work with non-(US|UK|CA)

WP AVS settings were giving 50 pts for address match not performed
and another 50 pts for zip match not performed, leading to donations
from anywhere with no address fields failing the antifraud check.

Change-Id: Ia7db5a1120b1dff6b4c2894a96b4889e8c81adad