html5: add worker js back

demos/html5/demo_video.c

@@ -33,6 +33,6 @@ int main() {
     // 75% window, msaa x2
     window_create(0.75f, 0);
     window_aspect_lock(910, 540);
-    video_t *v = video( "bjork-all-is-full-of-love.mp4", VIDEO_RGB );
+    video_t *v = video( "videos/pexels-pachon-in-motion-17486489.mp4", VIDEO_RGB );
     window_loop(render, v);
 }

demos/html5/template.html

@@ -157,5 +157,7 @@
     // document.addEventListener('MSFullscreenChange', exitFullscreen, false);
     // document.addEventListener('webkitfullscreenchange', exitFullscreen, false);
     </script>
+
+    <script src="index.coi.worker.js"></script>
   </body>
 </html>