revert missing retry and opt keep session (#9755)

* Revert "fix missing retry (#8750)"

If `hasRetry` is true: there is a retry timeout;
If `hasRetry` is false: there is no retry button;

In
https://github.com/rustdesk/rustdesk/discussions/8748#discussioncomment-10081038,when
doesn't want inactive to retry,
cf0e3ec303/flutter/lib/models/model.dart (L444),
1.2.3 always show retry no matter what `hasRetry` is.

This reverts commit c3c99ba107.

* not keep session if there is no remote connection left.

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

---------

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

flutter/lib/models/model.dart

@@ -638,7 +638,7 @@ class FfiModel with ChangeNotifier {
       {bool? hasCancel}) {
     msgBox(sessionId, type, title, text, link, dialogManager,
         hasCancel: hasCancel,
-        reconnect: reconnect,
+        reconnect: hasRetry ? reconnect : null,
         reconnectTimeout: hasRetry ? _reconnects : null);
     _timer?.cancel();
     if (hasRetry) {