toaster.bbclass: show packages that were setscened into existence too

toaster.bbclass: show packages that were setscened into existence too

We were previously ignoring pkgs that came in from a setscene like from
an sstate mirror).  With this patch we can use pkgs than come from sstate
for image customisation as well.

Also remove unused variable.

[YOCTO #9137]

(From OE-Core rev: 4ea7f96ae28ff53867f5ffa4158076761676d288)

Signed-off-by: brian avery <brian.avery@intel.com>
Signed-off-by: Michael Wood <michael.g.wood@intel.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>