[wip/jido-pick-object] Remove move3d-assets from makefile

In order to save diskspace on the robot please install move-3D assets directly from the repository : trac.laas.fr/git/robots/move3d-assets. Install in ${ROBOTPKG_BASE}/share/move3d/assets

cd ${ROBOTPKG_BASE}/share/
mkdir move3d
cd move3d
git clone ssh://trac.laas.fr/git/robots/move3d-assets assets