Bug 22225: Correctly use invoiceincgst over listincgst

Bug 22225: Correctly use invoiceincgst over listincgst

Mistakenly, we were looking at listincgst in the templates but using
invoiceincgst in the scripts. This patch rectifies that by switching to
use invoiceincgst in the templates too.

Signed-off-by: Liz Rea <wizzyrea@gmail.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
(cherry picked from commit 43047ee734e2b6b650e43710a712390433cbb2bd)
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>