fix(swatch+swatchgroup): add missing isAddSwatch arg for swatchgroup story

Author: cdransf

components/swatchgroup/stories/swatchgroup.stories.js

@@ -80,6 +80,7 @@ export default {
 		containerWidth: "200px",
 		isDisabled: false,
 		isSelected: false,
+		isAddSwatch: false,
 		items: [
 			{swatchColor: "rgb(184, 109, 70)",},
 			{swatchColor: "rgb(240, 56, 35)",},