message: Repair redball tutorial.
  Our GitHub Pages site is currently using an older version of the
  filament wasm file so we should avoid using the new API here.
diff: @@ -22,7 +22,7 @@ class App {
  const material = engine.createMaterial(filamat_url);
  const matinstance = material.createInstance();
  const red = [0.8, 0.0, 0.0];
  - matinstance.setColor3Parameter('baseColor', Filament.RgbType.sRGB, red);
  + matinstance.setColorParameter('baseColor', Filament.RgbType.sRGB, red);
  matinstance.setFloatParameter('roughness', 0.5);
  matinstance.setFloatParameter('clearCoat', 1.0);
  matinstance.setFloatParameter('clearCoatRoughness', 0.3);
  