evas: fix ply example after adding of new savers and loaders.

evas: fix ply example after adding of new savers and loaders.

Summary:
Before adding of new saver and loader for ply format we had a chance to set EVAS_CANVAS3D_SHADE_MODE_VERTEX_COLOR
for every mesh, now we save only existing atributes and there are a lot of meshes we have to set EVAS_CANVAS3D_SHADE_MODE_VERTEX_COLOR.

[FIX]

Reviewers: cedric, raster, Hermet

Subscribers: jpeg, artem.popov

Differential Revision: https://phab.enlightenment.org/D3412

Signed-off-by: Cedric BAIL <cedric@osg.samsung.com>