overview-manual, mega-manual: Updated user-configuration.png image

This image was out of date.  I updated it.

(From yocto-docs rev: feb287a72201363c43607508d2e8f1da3993f93f)

Signed-off-by: Scott Rifenbark <srifenbark@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>