removed unused config method

Author: zonyitoo

crates/shadowsocks/src/config.rs

@@ -279,15 +279,6 @@ impl ServerConfig {
         self.timeout
     }
 
-    /// Timeout for established tunnels (connection)
-    pub fn connection_timeout(&self) -> Duration {
-        // Connection should be kept at least 24 hours.
-        // Otherwise connection will be closed accidently if there are no data exchanged from both ends.
-        static MIN_CONNECTION_TIMEOUT: Duration = Duration::from_secs(24 * 60 * 60);
-
-        std::cmp::max(MIN_CONNECTION_TIMEOUT, self.timeout.unwrap_or(Duration::from_secs(0)))
-    }
-
     /// Get server's remark
     pub fn remarks(&self) -> Option<&str> {
         self.remarks.as_ref().map(AsRef::as_ref)