Make obs-worker depend on either libarchive-tools or bsdtar
Since libarchive 3.2.1-2 bsdtar has been provided by libarchive-tools, while 3.4.0-1 dropped bsdtar transitional package completely.
Since libarchive 3.2.1-2 bsdtar has been provided by libarchive-tools, while 3.4.0-1 dropped bsdtar transitional package completely.