sorder: Widen coordinate columns to four characters

sorder: Widen coordinate columns to four characters

When formatting coordinates for fixed-width output, the width should
be at least four characters.

Columns x,y, start and end use three.  Has always been that way,
except for end, which used two until commit e07fb30 (v4.2.13).

Widen them all to four.  This cleans up output for world sizes between
200 and 1998.

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