Bug 18360: Allow to delete a cancelled order from open basket

Bug 18360: Allow to delete a cancelled order from open basket

Doing this under flag of order_manage and not on the higher level
of baskets.

Starting here with a single order delete for cancelled lines. So
deleting an open order line requires cancelling it first. Can be
extended later if needed.

Test plan:
Pick an open basket with cancelled lines.
Try to delete a few lines.
Test that you cannot do this on an closed basket. (Bonus: manipulate
URL with basketno, ordernumber and op=cud-delete-order.)

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Michaela Sieber <michaela.sieber@kit.edu>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>