commands: Always put ship or land unit before retreating it

commands: Always put ship or land unit before retreating it

boar() puts before retreating, the other callers afterwards.  Subtle
difference, because putting resets the owner of the dead to POGO.

Until the commit before previous, retreat didn't fully work after put.
Now it does.  The subtle difference between boar() and the other
callers still exists.  It's better to do it the same everywhere, as
subtle differences invite bugs.  Since changing boar() is not
practical, change the others.

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