Bug 23927: Do not copy invoiceid for a new duplicated order

Bug 23927: Do not copy invoiceid for a new duplicated order

When an order is created from an existing one (duplication), then the
invoice should be set to null instead of retrieved.

Test plan:
- receive an order
- in a new basket, add an order "From exisitions orders (copy)"
- search your received order
- duplicate
- go to the bibliographic record "Acquisition details" tab
=> Without this patch you will see that the invoice is the same for the
two orders
=> With this patch the invoice for the new order is not set

Signed-off-by: Séverine QUEUNE <severine.queune@bulac.fr>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>