top: lessen overhead when 'bottom window' isn't active

top: lessen overhead when 'bottom window' isn't active

In the commits referenced below special code was added
to make the bottom window sticky and fix the bug after
'Cap_nl_clreos' was traded for the 'Cap_clr_eol' loop.

However, there's always major overhead associated with
interacting with a terminal. So we'll only abandon the
single 'Cap_nl_clreos' putp in favor of repeated calls
with 'Cap_clr_eol' when a bottom window isn't present.

Reference(s):
. May, 2022 - bottom window batch bug fix
commit 793f3e85aeb41788e359c2f6f387812c328ac097
. May, 2022 - bottom window made sticky
commit 0f2a755b0b2754fca79545984e25ec52f4ae4444

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