Update carousel.html

[seul1230]

[Fixed carousel problem] Now you can add 2 or more carousels in a page just with distinct carousel_id. You can use codes below.

{% capture carousel_images %}
https://bit.ly/2BBbVhc
https://bit.ly/2DOtxXB
{% endcapture %}
{% include elements/carousel.html carousel_id="1" %}