removed unused tunnel fn warnings with neat linter flag

"we got `#[expect(dead_code)]` before gta 6"

veilid-cli/src/ui.rs

@@ -34,6 +34,7 @@ pub trait UISender: Send {
         bps_up: u64,
         peers: Vec<json::JsonValue>,
     );
+    #[expect(dead_code)]
     fn set_tunnel_status(&mut self, tunnels: Option<Vec<json::JsonValue>>);
     fn set_config(&mut self, config: &json::JsonValue);
     fn set_connection_state(&mut self, state: ConnectionState);