Generate image when using element OR selector

```js
cy.get('.todos, .stat').cyclope('todos-and-stats.png', {
elementSelector: '.todos, .stat',
})
```

Currently ignores the second CSS selector

Start by reproducing the shown Cypress call with the `.todos, .stat` selector and inspect the implementation behind `cy.get(...).cyclope` and its `elementSelector` option. Done means both CSS selectors contribute to the generated `todos-and-stats.png` image rather than the second selector being ignored.

Written by the indexing model from the issue text.