OpProgress: Erase lines when done

It's interesting to the user to see the progress when it happens,
but arguably once it's done it is just visual clutter, so let's
not write newlines, and when we are done, instead of appending
"Done", let's just empty the line.

This requires some effort to keep apt-cdrom happy which just writes
lines to stdout itself. Bad apt-cdrom. Maybe there is a better fix
for it, but this gets us going.

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