evolve: point to '--abort' in verbose status message
f6979d64b9fb (evolve: point to '--abort' in error message, 2018-04-22)
changed "hg update -C ." to "hg evolve --abort" in error
messages. This commit makes the same change in the verbose status
message (the one that warns about unfinished evolve).
There's still one mention "hg update -C" in our codebase. That's after
"hg evolve --content-divergent" fails, but I don't think "hg evolve
--abort" works in that case (yet?).
