always call fix_nated_register to set received avp (#95)

kamailio/registrar-role.cfg

@@ -63,8 +63,8 @@ route[HANDLE_REGISTER]
         if (nat_uac_test("3")) {
             xlog("L_INFO", "$ci|log|correcting NATed contact in registration\n");
             force_rport();
-            fix_nated_register();
         }
+        fix_nated_register();
 
         ## KAZOO-1846: Cisco SPA8000 freaks out on options pings
         if (!($ua =~ "Linksys/SPA8000"