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>