Bug 16496 - accountlines.issue_id not set when new overdue is processed

Bug 16496 - accountlines.issue_id not set when new overdue is processed

It appears that somehow the adding of issue_id to accountlines for new
fines was missed! This is incredibly important, otherwise UpdateFine
will always create a new fine!

Test Plan:
1) Create a new overdue checkout
2) Run fines.pl to generate an accountline for it
3) Note it has no issue_id
4) Apply this patch
5) Repeat steps 1 and 2
6) Note it now has an issue_id!

Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>