tarbz2: use DEST directory name in tar archive

tarbz2: use DEST directory name in tar archive

When specifying the "-f" option, this will allow the decompression to be
done in DEST directory instead of the source directory. This avoids
the necessity to create a copy first, tarbz2 it, and then remove the
temporary copy.

Signed-off-by: Hugo Villeneuve <hugo@hugovil.com>