Fix shadow types: inner and none

[seekuehe]

This PR fixes a previously undetected bug for shadow types none and inner which images and shapes.
Since Pitch only uses the type outer for images, the bug did not break export.

Code Snippet for the Sandbox

let pptx = new PptxGenJS();
let slide = pptx.addSlide();

slide.addImage({
  x: 1,
  y: 2,
  path: "https://images.unsplash.com/photo-1506744038136-46273834b3fb?crop=entropy&cs=tinysrgb&fit=max&fm=jpg&ixid=MnwyMTIyMnwwfDF8c2VhcmNofDJ8fGxhbmRzY2FwZXxlbnwwfHx8fDE2NTg5MzE0MDM&ixlib=rb-1.2.1&q=80&w=1080",
  shadow: {
    type: "none",
    angle: 90,
    blur: 10,
    color: "000000",
    offset: 4,
    opacity: 1
  }
});

slide.addImage({
  x: 3,
  y: 2,
  path: "https://images.unsplash.com/photo-1506744038136-46273834b3fb?crop=entropy&cs=tinysrgb&fit=max&fm=jpg&ixid=MnwyMTIyMnwwfDF8c2VhcmNofDJ8fGxhbmRzY2FwZXxlbnwwfHx8fDE2NTg5MzE0MDM&ixlib=rb-1.2.1&q=80&w=1080",
  shadow: {
    type: "inner",
    angle: 90,
    blur: 10,
    color: "000000",
    offset: 4,
    opacity: 1
  }
});

slide.addImage({
  x: 5,
  y: 2,
  path: "https://images.unsplash.com/photo-1506744038136-46273834b3fb?crop=entropy&cs=tinysrgb&fit=max&fm=jpg&ixid=MnwyMTIyMnwwfDF8c2VhcmNofDJ8fGxhbmRzY2FwZXxlbnwwfHx8fDE2NTg5MzE0MDM&ixlib=rb-1.2.1&q=80&w=1080",
  shadow: {
    type: "outer",
    angle: 90,
    blur: 10,
    color: "000000",
    offset: 4,
    opacity: 1
  }
});

// When type is not provided, defaults to `outer`
slide.addImage({
  x: 7,
  y: 2,
  path: "https://images.unsplash.com/photo-1506744038136-46273834b3fb?crop=entropy&cs=tinysrgb&fit=max&fm=jpg&ixid=MnwyMTIyMnwwfDF8c2VhcmNofDJ8fGxhbmRzY2FwZXxlbnwwfHx8fDE2NTg5MzE0MDM&ixlib=rb-1.2.1&q=80&w=1080",
  shadow: {
    angle: 90,
    blur: 10,
    color: "000000",
    offset: 4,
    opacity: 1
  }
});

slide.addShape(pptx.ShapeType.rect, { fill: { color: "FF0000" }, x: 1, y: 0.5, shadow: {
    type: "none",
    angle: 90,
    blur: 10,
    color: "000000",
    offset: 4,
    opacity: 1
  } });

  slide.addShape(pptx.ShapeType.rect, { fill: { color: "FF0000" }, x: 3, y: 0.5, shadow: {
    type: "inner",
    angle: 90,
    blur: 10,
    color: "000000",
    offset: 4,
    opacity: 1
  } });

  slide.addShape(pptx.ShapeType.rect, { fill: { color: "FF0000" }, x: 5, y: 0.5, shadow: {
    type: "outer",
    angle: 90,
    blur: 10,
    color: "000000",
    offset: 4,
    opacity: 1
  } });

// When type is not provided, defaults to `outer`
  slide.addShape(pptx.ShapeType.rect, { fill: { color: "FF0000" }, x: 7, y: 0.5, shadow: {
    angle: 90,
    blur: 10,
    color: "000000",
    offset: 4,
    opacity: 1
  } });

pptx.writeFile({ fileName: "PptxGenJS-Shadows.pptx" });