do not dedup flush events

kamailio/presence-role.cfg

@@ -105,7 +105,7 @@ event_route[kazoo:consumer-event-presence-update]
 {
     $var(call-id) = $(kzE{kz.json,Call-ID});
     if( $(kzE{kz.json,Event-Package}) == "dialog") {   
-        if($sht(p=>$var(call-id)) != $(kzE{kz.json,State})) {
+        if($sht(p=>$var(call-id)) != $(kzE{kz.json,State}) || $(kzE{kz.json,Flush-Level}) != $null) {
              xlog("L_INFO", "$var(call-id)|log|received $(kzE{kz.json,Event-Package}) update for $(kzE{kz.json,From}) state $(kzE{kz.json,State})");
              $sht(p=>$(kzE{kz.json,Call-ID})) = $(kzE{kz.json,State});
              #!ifdef FAST_PICKUP-ROLE