improve bluetooth examples

- reorder test buttons
- add destroy bonding API test

Signed-off-by: Corentin Lecouvey <corentin.lecouvey@open.eurogiciel.org>
send a different PostMessage to JS when the discovery is stopped automaticaly

Signed-off-by: Corentin Lecouvey <corentin.lecouvey@open.eurogiciel.org>