tests/fire: Use build command for setup

tests/fire: Use build command for setup

Setup uses edit to build units.  Stupid idea, because that misses unit
initialization normally done by build, directly or via
unit_wipe_orders().  Use build instead.

Changes test output harmlessly: ship xbuilt, ybuilt go from 0,0 to the
building sector, ship#0's builder goes from 98 to 0, all ships'
cargostart and cargoend go from 0 to -1, jhb range from 0 to 35, and
land unit retreat percentage from 0 to 42.

Setup no longer needs country 98.  Drop it.

Setup no longer copies 2,0 to 0,0 messing up its distribution center.
Harmless.

Setup doesn't need POGO's tech level anymore, so don't set it to 400.
Nukes are now built at their required tech level.  Also harmless.

Signed-off-by: Markus Armbruster <armbru@pond.sub.org>