applications: nrf_desktop: Start discovery right after connected

Start BLE discovery right after connection is established. There is
no need to wait for security level 2. The connection security will
be automatically increased, because it's needed to access HIDS.

Jira: NCSDK-14084

Signed-off-by: Marek Pieta <[email protected]>

Author: MarekPieta

applications/nrf_desktop/src/modules/ble_discovery.c

@@ -340,7 +340,7 @@ static bool app_event_handler(const struct app_event_header *aeh)
 			cast_ble_peer_event(aeh);
 
 		switch (event->state) {
-		case PEER_STATE_SECURED:
+		case PEER_STATE_CONNECTED:
 			discovering_peer_conn = event->id;
 			bt_conn_ref(discovering_peer_conn);
 			k_work_submit(&next_discovery_step);