Banking Details; Credit Card Masking now displays last 4 characters only

Credit Card masking has been updated to display only the last 4 characters of the Credit Card number if the 'ShowUnmaskedAccountDetails' permission is set to Deny.

E.g.
Previously a Mastercard would display as: 5430 48XX XXXX 9992

A Mastercard will now display as: XXXX XXXX XXXX 9992

This change is to keep in line with how the banks are now displaying credit card numbers.