[FIX] web_editor: restore broken VideoDialog options

- To enable loop on a video, only setting the 'loop' URL parameter
to 1 will not work anymore. We also need to set the playlist parameter
to the video ID.

- Sound is no longer allowed in autoplay because of new autoplay
policies of most browsers. To make autoplay work, the video must be
explicitely muted.

closes odoo/odoo#34323

Signed-off-by: Quentin Smetz (qsm) <qsm@odoo.com>