[FIX] web_editor: allow multiple autoplay vimeo videos

Before this commit, it was not possible to have two vimeo videos playing
at the same time on the same page.
Steps to reproduce the bug:
- Drop two blocks containing an image
- Replace the two images with vimeo videos
- For each of these videos, enable the autoplay feature

=> Only one of these videos is played automatically. When you play the
other one, the first one is paused and vice versa. It is impossible to
have both videos running at the same time. This commit allows to correct
this by allowing to play several vimeo videos at the same time when they
have the autoplay feature activated. Note that if the option is not
enabled, the behavior remains similar to before, only one video can be
played at a time.

opw-3107447

closes odoo/odoo#108864

X-original-commit: 5ad43068
Signed-off-by: Quentin Smetz (qsm) <qsm@odoo.com>