fix mixed case in notifications

ensure notification from omnipresence is treated as lowercase since we forced the presentity to lowercase
(cherry picked from commit 18475a4a40)

kamailio/presence-role.cfg

@@ -106,7 +106,7 @@ event_route[kazoo:consumer-event-presence-update]
              xlog("L_INFO", "payload $kzE");
              $sht(p=>$(kzE{kz.json,Call-ID})) = $(kzE{kz.json,State});
              kazoo_pua_publish($kzE);
-             pres_refresh_watchers("$(kzE{kz.json,From})", "$(kzE{kz.json,Event-Package})", 1);
+             pres_refresh_watchers("$(kzE{kz.json,From}{s.tolower})", "$(kzE{kz.json,Event-Package})", 1);
         } else {
             xlog("L_INFO", "received duplicate $(kzE{kz.json,Event-Package}) update for $(kzE{kz.json,From})");
             xlog("L_INFO", "payload $kzE");