Remove columns lnd, pln from spy report to fix spy unit leak

Remove columns lnd, pln from spy report to fix spy unit leak

The values in these columns were computed by count_sect_units() and
count_sect_planes(), which included land units and planes in the count
that aren't shown by prunits() and prplanes(), namely own and embarked
units.  Confusing.  Moreover, count_sect_planes() and prunits() rolled
dice separately for spy units.  This could leak the presence of spies
even when prunits() didn't show them.

All fixable, but not worth the trouble; just remove the counts.