Add a wistia path for the video shortcode

[cwickham]

E.g. to avoid having to insert this:

<script src="https://fast.wistia.com/player.js" async></script><script src="https://fast.wistia.com/embed/at01coepkh.js" async type="module"></script><style>wistia-player[media-id='at01coepkh']:not(:defined) { background: center / contain no-repeat url('https://fast.wistia.com/embed/medias/at01coepkh/swatch'); display: block; filter: blur(5px); padding-top:58.76%; }</style> <wistia-player media-id="at01coepkh" aspect="1.701851851851852"></wistia-player>

Have something like:

{{< video src="https://fast.wistia.com/medias/at01coepkh" >}}