progress: move the "finished" tag to a column where it won't obscure data

progress: move the "finished" tag to a column where it won't obscure data

The "done" pointer and the "%done" fields are still useful because they
indicate _actual_ progress, not the work that has been _promised_.
So it is possible for a crawl to be "finished" (all extents queued)
but not "100.0000%" (some of those extents still active or in the queue).

"deferred" state isn't particularly useful, so drop it.

"finished" state implies no ETA, so that column is unused.

Signed-off-by: Zygo Blaxell <bees@furryterror.org>