fix is_public (#13701)

Signed-off-by: 21pages <sunboeasy@gmail.com>

src/hbbs_http/sync.rs

@@ -278,7 +278,7 @@ fn heartbeat_url() -> String {
         Config::get_option("api-server"),
         Config::get_option("custom-rendezvous-server"),
     );
-    if url.is_empty() || url.contains("rustdesk.com") {
+    if url.is_empty() || crate::is_public(&url) {
         return "".to_owned();
     }
     format!("{}/api/heartbeat", url)