Issue #841: Remove the carousel buttons fro 'audio' playlist.
Issue #841: Remove the carousel buttons fro 'audio' playlist.

The playlist is actually a carousel,
as it's not possible to use <amp-bind>.
But that doesn't match native WP UI.
So remove the buttons that go other carousel items.
One can click the tracks to go to another track.

ampproject/amp-toolbox-php,ampproject/amp-toolbox-php