trap-manager: Remove reqid parameter from install() and change return type

Reqids for the same traffic selectors are now stable so we don't have to
pass reqids of previously installed CHILD_SAs.  Likewise, we don't need
to know the reqid of the newly installed trap policy as we now uninstall
by name.

src/libcharon/sa/ike_sa.c

@@ -2035,8 +2035,7 @@ METHOD(ike_sa_t, reestablish, status_t,
 					break;
 				case ACTION_ROUTE:
 					charon->traps->install(charon->traps, this->peer_cfg,
-										   child_sa->get_config(child_sa),
-										   child_sa->get_reqid(child_sa));
+										   child_sa->get_config(child_sa));
 					break;
 				default:
 					break;