Fix a possible memory leak in ct_move_scts

Fix a possible memory leak in ct_move_scts

Instead of trying to move the doomed sct back
to the src stack, which may fail as well, simply
free the sct object, as the src list will be
deleted anyway.

Reviewed-by: Paul Yang <kaishen.yy@antfin.com>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/22762)

(cherry picked from commit a435d786046fabc85acdb89cbf47f154a09796e1)