Desired behavior for new posts when FilterNewPosts setting is enabled
is that people with admin_level >= 2 and post authors should see their
post on the frontpage, while all other unprivileged users shouldn't.
The logic for this is already in `files.helpers.listing` but it was
overridden by a second filter condition which required `state_mod =
VISIBLE`.
`(state_mod = VISIBLE | author_id = v.id) & (state_mod = VISIBLE)`
simplifies in an unfortunate way. The latter condition was also not
conditional on admin_level. Simply removing it fixes the listing
for both post authors and privileged users.
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