top: allow the summary memory lines to print 2 abreast

top: allow the summary memory lines to print 2 abreast

The commit shown below introduced two abreast printing
for %Cpu statistics. But, the Memory & Swap lines have
always been printed on separate lines when '4' was on.

With this commit, those lines will now be treated just
like %Cpu stats, either separate lines or two abreast.

Reference(s):
. May 2020, added '4' toggle for 2 abreast
commit 59f5a37a247184b3009af963706ca68198067185

Signed-off-by: Jim Warner <james.warner@comcast.net>