Bug 26403: (QA follow-up) Add missing debit and credit types to includes

Bug 26403: (QA follow-up) Add missing debit and credit types to includes

This adds the missing debit and credit types to the includes, namely:
DISCOUNT, PURCHASE, PAYOUT, and VOID.

I sorted them as they appear in the GUI (alphabetically) so it's a little
easier to spot missing ones.

Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
(cherry picked from commit c76533c5a1bc740ded800039ef5843e1345be4e5)
Signed-off-by: Matt Blenkinsop <matt.blenkinsop@ptfs-europe.com>