LocalProxy config error

[holipay]

Describe the bug
After setting up the local agent, the update feed sync was successful. However, if you delete a local agent, all feeds will not be synced, including feeds that would otherwise not be proxyed.
设置本地代理后更新提要同步成功。但如果删除本地代理，所有提要都无法同步,包括原本不用代理的提要。

You need to find the configuration file in the user's .lettura folder and delete the proxy settings in it (even if the IP and prot are empty) in order to update the feed without proxy normally.
需要在用户.lettura文件夹中，找到配置文件，删除其中代理的设置内容（哪怕ip 和 prot 为空），才能正常更新不要代理的提要。

In the config file, whether you should remove the ip and port entries instead of setting the proxy ip and port to empty
在config文件中，是否应该删除ip 和port 项，而不是设置代理 ip 和port 为空， scheme = socks5h:// :

if let Some(config) = user_config {
if let Some(proxy) = config.local_proxy {
log::info!("user_config.local_proxy {:?}", proxy);

  let mut scheme = String::from("socks5h://");

  scheme.push_str(&proxy.ip.to_string());
  scheme.push_str(":");
  scheme.push_str(&proxy.port.to_string());