simtrace2-cardem: use local sim on exit

There is no obvious reason why the st should be stuck in cardem mode
without a working running util on the host side since there is no state
that is being kept, so switch back to using the local sim upon reset.

Change-Id: Ib622af0027d40b4e8afbb0fa0d3689f0dbfcac92

host/src/simtrace2-cardem-pcsc.c

@@ -420,6 +420,7 @@ static void signal_handler(int signal)
 	switch (signal) {
 	case SIGINT:
 		osmo_st2_cardem_request_card_insert(ci, false);
+		osmo_st2_modem_sim_select_local(ci->slot);
 		exit(0);
 		break;
 	default: