Try to fix rustdesk#5602 (comment)

Author: rustdesk

src/server/connection.rs

@@ -1379,7 +1379,7 @@ impl Connection {
         }
         #[cfg(not(any(target_os = "android", target_os = "ios")))]
         if self.file_transfer.is_some() {
-            if crate::platform::is_prelogin() || self.tx_to_cm.send(ipc::Data::Test).is_err() {
+            if crate::platform::is_prelogin() { // }|| self.tx_to_cm.send(ipc::Data::Test).is_err() {
                 username = "".to_owned();
             }
         }