Purpose
=======
There's one special case for the participant count update.

When we leave a room, if we are the last participant, we directly
update the participant count without waiting for the cool down (because
the participant might change the page and so the JS might not be loaded
anymore).

But, Jitsi made a change and now, when we hanging up the room, when
the event "videoConferenceLeft" is called, we are the only participant
in the list even if they're still other people in the room. So every
time someone hanging up the room, he will send the "zero participant"
update.

As we can not properly fix it (and be sure it will be "future proof"),
we dropped this update.

So now, some empty rooms might be marked as having one participant,
but no room will be marked as having zero participant if they are not
empty (and we prefer this behavior than the opposite).

Task-2350117

closes odoo/odoo#59378

X-original-commit: 84575078b80a7bf865ed52d1682548af3346ec14
Signed-off-by: Thibault Delavallee (tde) <tde@openerp.com>