lscp: always show snapshots, even if marked minor

When the average user types `lscp` and doesn't see the snapshot they
just tried to make, it can be very confusing. Add an additional check
to ensure snapshots are never omitted from lscp output.

Signed-off-by: Dan McGee <dan@archlinux.org>
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
lscp: show snapshots, even if marked minor (reverse mode)

Apply the same change as the commit
d04aea7db2281d2f22d1c943dc5791931db8c474 "lscp: always show snapshots,
even if marked minor" for reverse mode.

Cc: Dan McGee <dan@archlinux.org>
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>