修复无法`重启媒体服务器`，`删除远端通信链路`的问题

renxh

2021-10-28 63bdaa0adf37baa49a1622f7cfc3d5f055bda495

 src/main/java/com/genersoft/iot/vmp/conf/security/SecurityUtils.java

@@ -48,7 +48,7 @@
        Authentication authentication = getAuthentication();
        if(authentication!=null){
            Object principal = authentication.getPrincipal();
            if(principal!=null){
            if(principal!=null && !"anonymousUser".equals(principal)){
                LoginUser user = (LoginUser) authentication.getPrincipal();
                return user;
            }