builtin/revert.c: move free-ing of "revs" to replay_opts_release()

builtin/revert.c: move free-ing of "revs" to replay_opts_release()

In [1] and [2] I added the code being moved here to cmd_revert() and
cmd_cherry_pick(), now that we've got a "replay_opts_release()" for
the "struct replay_opts" it should know how to free these "revs",
rather than having these users reach into the struct to free its
individual members.

1. d1ec656d68f (cherry-pick: free "struct replay_opts" members,
   2022-11-08)
2. fd74ac95ac3 (revert: free "struct replay_opts" members, 2022-07-01)

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>