This still achieves a logic issue before the Spree upgrade, where
switching from pick-up to delivery affects whether simultaneous changes
to shipping address are ignored or not.
This behaviour can be fixed in a separate PR.
The shipping methods are updated to their target settings after the
subscription order has been created, so the order is created with the
"require_ship_address" factory default which is "true".
The shipping method setting at time of order creation has implications
on whether a shipment is set up for the order or not.
This fixes some assertions from using the same subscription shipping and
billing addresses, and distributor address.
One of the specs also pass because the subscription shipping address
matches the distributor address. This commit makes that scenario
clearer.
