[FIX] web_editor: set recovery connection to 3s

When trying to recover peer to peer connection, the timeout of 500ms or
1000ms might be too short and 15000ms in unnecessary too long.

If the timeout is too short, it could remove the connection before the
peer to peer had the time to reconnect to it. When we call
`_recoverConnection` on `disconnect` in `oniceconnectionstatechange`
or `onconnectionstatechange`, the signal `disconnect` does not
necessarily mean that it will remain disconnected. Doing nothing could
be enough to reconnect.
(see: https://w3c.github.io/webrtc-pc/#dom-rtcicetransportstate-disconnected

)

closes odoo/odoo#112001

Signed-off-by: David Monjoie (dmo) <dmo@odoo.com>