[fuseCut] Exported tetrahedralization debug meshes have no colors

[almarouk]

The problem is caused by the save function of class Mesh that doesn't take into consideration the colors when creating the Assimp Scene.

AliceVision/src/aliceVision/mesh/Mesh.cpp

Line 87 in 3472774

void Mesh::save(const std::string& filepath)

[github-actions]

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