Bug 26689: Check for specific template then fallback - printfeercpt

Bug 26689: Check for specific template then fallback - printfeercpt

This patch adds a check for a more specific ACCOUNT_CREDIT template
(named to match the credit_type_code of the credit line) prior to
falling back to the ACCOUNT_CREDIT template.

Test plan
1/ On a patrons account page use the print option on a series of credit
lines with differing credit types (Payment, Lost Item Return, Writeoff)
2/ Note that the same template 'ACCOUNT_CREDIT' is used for all types
3/ Apply the patch
4/ Run step 1 again and note all still print using ACCOUNT_CREDIT
5/ Add a new notice template under the 'circulation' module with a code
that matches one of your account credit types (PAYMENT, WRITEOFF,
LOST_FOUND)
6/ Run step 1 again and note that where you have added a specific notice
for that credit type it has been used.

Signed-off-by: Sally <sally.healey@cheshiresharedservices.gov.uk>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>