Bug 26689: Check for specific template then fallback - printinvoice

Bug 26689: Check for specific template then fallback - printinvoice

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

Test plan
1/ On a patrons account page use the print option on a series of debit
lines with differing credit types (Overdue, Payout)
2/ Note that the same template 'ACCOUNT_DEBIT' is used for all types
3/ Apply the patch
4/ Run step 1 again and note all still print using ACCOUNT_DEBIT
5/ Add a new notice template under the 'circulation' module with a code
that matches one of your account debit types (OVERDUE, PAYOUT)
6/ Run step 1 again and note that where you have added a specific notice
for that debit 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>