message: make white texture PO2 so it works in WebGL v1
diff: @@ -554,13 +554,13 @@ function createWhiteTexture()
  {
  const canvas = document.createElement('canvas');
  - canvas.width = 10;
  - canvas.height = 10;
  + canvas.width = 16;
  + canvas.height = 16;
  const context = canvas.getContext('2d');
  context.fillStyle = 'white';
  - context.fillRect(0, 0, 10, 10);
  + context.fillRect(0, 0, 16, 16);
  return new Texture(new BaseTexture(new CanvasResource(canvas)));
  }
  