FT: Force key configuration after association in FT-over-DS

This seems to be needed at least with mac80211 when a STA is using
FT-over-DS to reassociate back to the AP when the AP still has the
previous association state.

src/ap/wpa_auth_ft.c

@@ -1227,6 +1227,7 @@ static int wpa_ft_rrb_rx_request(struct wpa_authenticator *wpa_auth,
 			   "RRB Request");
 		return -1;
 	}
+	sm->ft_over_ds = 1;
 
 	wpa_hexdump(MSG_MSGDUMP, "FT: RRB Request Frame body", body, len);