pkgset: Remove package skip optimization for bootable products
    
    If buildinstall is supposed to run, we can't pick only some packages
    from the tag. The temporary repo is used as a source for lorax. There
    could very well be packages not meant to be shipped in the compose that
    are still essential for building the bootable images.
    
    Signed-off-by: Lubomír Sedlář <lsedlar@redhat.com>