fix clippy warning

crates/hedz_reloaded/src/config.rs

@@ -81,8 +81,7 @@ impl From<NetworkingConfig> for NetConfig {
 }
 
 fn parse_addr(addr: Option<String>) -> SocketAddr {
-    addr.map(|addr| addr.parse().ok())
-        .flatten()
+    addr.and_then(|addr| addr.parse().ok())
         .unwrap_or_else(|| "127.0.0.1:31111".parse().unwrap())
 }