line-log: allow non-patch diff formats with -L

line-log: allow non-patch diff formats with -L

Now that -L flows through log_tree_diff_flush() and diff_flush(),
metadata-only diff formats work because they only read filepair
fields (status, mode, path, oid) already set on the pre-computed
pairs.

Expand the allowlist in setup_revisions() to also accept --raw,
--name-only, --name-status, and --summary.  Diff stat formats
(--stat, --numstat, --shortstat, --dirstat) remain blocked because
they call compute_diffstat() on full blob content and would show
whole-file statistics rather than range-scoped ones.

Signed-off-by: Michael Montalbo <mmontalbo@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>