Bluetooth: BAP: Fix notifying recv state for bonded devices

The scan_delegator_security_changed function had a few issues
that were addressed:
1) It used an internal field to check level rather than the
   value provided by the API
2) It did not treat bt_addr_le_is_bonded as a boolean return value
3) It did not properly truncate the recv state (fixed by using the
   proper function bass_notify_receive_state)

Signed-off-by: Emil Gydesen <emil.gydesen@nordicsemi.no>

subsys/bluetooth/audio/bap_scan_delegator.c

@@ -275,18 +275,15 @@ static void scan_delegator_security_changed(struct bt_conn *conn,
 					    bt_security_t level,
 					    enum bt_security_err err)
 {
-	if (err != 0 || conn->encrypt == 0) {
-		return;
-	}
 
-	if (bt_addr_le_is_bonded(conn->id, &conn->le.dst) == 0) {
+	if (err != 0 || level < BT_SECURITY_L2 || !bt_addr_le_is_bonded(conn->id, &conn->le.dst)) {
 		return;
 	}
 
 	/* Notify all receive states after a bonded device reconnects */
 	for (size_t i = 0; i < ARRAY_SIZE(scan_delegator.recv_states); i++) {
-		struct bass_recv_state_internal *internal_state = &scan_delegator.recv_states[i];
-		int gatt_err;
+		const struct bass_recv_state_internal *internal_state =
+			&scan_delegator.recv_states[i];
 
 		if (!internal_state->active) {
 			continue;
@@ -300,17 +297,9 @@ static void scan_delegator_security_changed(struct bt_conn *conn,
 		}
 
 		net_buf_put_recv_state(internal_state);
-
-		gatt_err = bt_gatt_notify_uuid(conn, BT_UUID_BASS_RECV_STATE,
-					       internal_state->attr, read_buf.data,
-					       read_buf.len);
+		bass_notify_receive_state(conn, internal_state);
 
 		k_sem_give(&read_buf_sem);
-
-		if (gatt_err != 0) {
-			LOG_WRN("Could not notify receive state[%d] to reconnecting assistant: %d",
-				i, gatt_err);
-		}
 	}
 }