config: Change asat not to consume shells

config: Change asat not to consume shells

The asat's impact on the target does not depend on its shell load (it
sometimes did until commit cf960a573 "Make anti-sat launch consistent
with interception", v4.3.23).  The shell use is logistical busy-work,
and economically irrelevant.  Remove it.

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