message: Fix material compilation error with device vertex domain
  A recent refactor was causing the following error when the vertex domain
  was set to `device`:
  ```
  ERROR: main.vs:23: 'material' : undeclared identifier
  ERROR: main.vs:23: 'materialVertex' : no matching overloaded function found
  ```
diff: @@ -16,11 +16,10 @@ void main() {
  // Run initMaterialVertex to compute material.worldPosition.
  MaterialVertexInputs material;
  initMaterialVertex(material);
  -#endif
  -
  // materialVertex() is guaranteed to be empty here, but we keep it to workaround some problem
  // in NVIDA drivers related to depth invariance.
  materialVertex(material);
  +#endif
  #else // defined(USE_OPTIMIZED_DEPTH_VERTEX_SHADER)
  