mega-manual: Updated sdk-manual figure used

I failed to copy the updated sdk-manual title figure to the
mega-manual/figures directory when the sdk-manual title had changed.
This was causing the title of the sdk-manual in the mega-manual
to render as the old one.

(From yocto-docs rev: cb111620cdce90d8f2f7e14a918a2307e81fe705)

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