rhcos-toolbox: Use default authfile on pull
rhcos-toolbox: Use default authfile on pull

See: https://bugzilla.redhat.com/show_bug.cgi?id=1728062

Signed-off-by: Steve Milner <0ccc179a7064b1255abc26f4a484566ce33a1da2@redhat.com>

coreos/toolbox