LP#1321411: restore ability to handle credit payments using a processor other than Stripe

This patch ensures that the processor name is passed
to OpenILS::Application::Circ::CreditCard::process_payment, avoiding
an exception thrown by Business::OnlinePayment.

Signed-off-by: Galen Charlton <gmc@esilibrary.com>
Signed-off-by: Dan Wells <dbw2@calvin.edu>