duplicate code and different from the others, please create a function in fb_contact_utils.js

```js
function getPreferredPictureBox() {
  return {
   width: Math.round(120 * SCALE_RATIO)
   height: Math.round(120 * SCALE_RATIO)
 }
}
```

120 is something that has to be documented as a constant and with comments indicating what it is