Per discussion with the design team the LayerSelectionDialog should only
have a close button.
See: https://bugzilla.yoctoproject.org/show_bug.cgi?id=2083#c10
(Bitbake rev: 65d92efe2786f21b8a2790ef0383f87b6dc15b57)
Signed-off-by: Joshua Lock <josh@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>