Fix generation numbers for order command

Fix generation numbers for order command

orde() uses a "clever" trick to get away with just one
check_ship_ok(): it makes a copy of the ship in the beginning, and
checks it at the end.  Generation numbers (commit 2fa5f652) break this
trick.  It could be fixed by manually marking the ship fresh.
Instead, check the ship the stupid, straightforward way, without a
copy.