top: correct functioning of the '-p' command line args

top: correct functioning of the '-p' command line args

With the introduction of a new '1' command line toggle
I have gone and broken a provision of the '-p' command
line switch (pids monitoring). Multiple pids could not
be specified through the use of comma delimited lists.

Thus, this commit simply corrects that newly added bug
which was born in the 'adjustment' commit shown below.

Reference(s):
. adjustment to '-1' implementation
commit 3e5c950a5e22320c9eece08584ac6b3292f09315

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