fix fileio progression status update

fix fileio progression status update

The compression % is no longer correct,
since it's no longer possible to make direct correlation
between nb bytes read and nb bytes written
due to large internal buffer inside CCtx
(exacerbated with --long).

The current "fix" is to no longer display the %.

A more complex solution will have to count exactly how much data has been consumed and compressed internally, within CCtx buffers.