remove to-do

Signed-off-by: fufesou <shuanglongchen@yeah.net>

src/plugin/callback_msg.rs

@@ -278,7 +278,6 @@ fn request_plugin_sign(id: String, msg_to_rustdesk: MsgToRustDesk) -> PluginRetu
         "parse signature data '{}'",
         signature_data
     );
-    // to-do: Request server to sign the data.
     thread::spawn(move || {
         let sign_url = format!("{}/lic/web/api/plugin-sign", get_api_server());
         let client = reqwest::blocking::Client::new();