dialog: execute internal event_route blocks under local_route type

- request_route type triggers additional script callbacks that could
  reset the transaction and can cause crashing
- reported by  Nuno Miguel Reis, FS#440

modules/dialog/dlg_handlers.c

@@ -1481,15 +1481,15 @@ void dlg_run_event_route(dlg_cell_t *dlg, sip_msg_t *msg, int ostate, int nstate
 	else
 		fmsg = msg;
 
-	if (exec_pre_script_cb(fmsg, REQUEST_CB_TYPE)>0)
+	if (exec_pre_script_cb(fmsg, LOCAL_CB_TYPE)>0)
 	{
 		dlg_ref(dlg, 1);
 		dlg_set_ctx_iuid(dlg);
 		LM_DBG("executing event_route %d on state %d\n", rt, nstate);
-		set_route_type(REQUEST_ROUTE);
+		set_route_type(LOCAL_ROUTE);
 		run_top_route(event_rt.rlist[rt], fmsg, 0);
 		dlg_reset_ctx_iuid();
-		exec_post_script_cb(fmsg, REQUEST_CB_TYPE);
+		exec_post_script_cb(fmsg, LOCAL_CB_TYPE);
 		dlg_unref(dlg, 1);
 	}
 }