fix license on librejs

libretube-theme/static/js/play.js

@@ -1,3 +1,4 @@
+// @license magnet:?xt=urn:btih:1f739d935676111cfff4b4693e3816e664797050&dn=gpl-3.0.txt GPL-v3-or-Later
 document.addEventListener('DOMContentLoaded', () => {
     const player = new Plyr(document.getElementById('player-ply'), {
         captions: { active: true, language: 'es' },
@@ -15,3 +16,4 @@ document.addEventListener('DOMContentLoaded', () => {
         ]
     });
 });
+// @license-end