git-svn: drop FakeTerm hack

git-svn: drop FakeTerm hack

Drop the FakeTerm hack, just like dfd46bae (send-email: drop
FakeTerm hack, 2023-08-08) did, for exactly the same reason.

It has been obsolete in git-svn since 30d45f798d (git-svn: delay term
initialization, 2014-09-14). Note that unlike send-email, we already
make sure to load Term::ReadLine only once. So this is just a cleanup,
and not fixing any bug.

Signed-off-by: Wesley Schwengle <wesleys@opperschaap.net>
Helped-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>