Bluetooth: Prefer Basic Mode on receipt of ConfigReq

If we choose to use Basic Mode then we have to refuse the received mode
and propose Basic Mode again.
Signed-off-by: NGustavo F. Padovan <padovan@profusion.mobi>
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>

net/bluetooth/l2cap.c

@@ -2621,9 +2621,6 @@ static int l2cap_parse_conf_req(struct sock *sk, void *data)
 			return -ECONNREFUSED;
 
 		break;
-	default:
-		pi->mode = l2cap_select_mode(rfc.mode, pi->conn->feat_mask);
-		break;
 	}
 
 done: