remove download directory from progress-bar

Currently the full download path is shown in the progress bar line. If the download path given by "-d" is pretty long, this leads to a "flickering" for longer filenames. To reduce this I suggest removing everything given by "-d" from the path and only show the directory sub-structure+filename and omit the base dir as it is given out on INFO the line before anyways.

I'd like some opinions before implementing