cabana: Prevent dialog that load autosaved file from blocking replay->start() (#28558)

tools/cabana/mainwin.cc

@@ -373,7 +373,8 @@ void MainWindow::eventsMerged() {
     if (!dbc()->msgCount() && !car_fingerprint.isEmpty()) {
       auto dbc_name = fingerprint_to_dbc[car_fingerprint];
       if (dbc_name != QJsonValue::Undefined) {
-        loadDBCFromOpendbc(dbc_name.toString());
+        // Prevent dialog that load autosaved file from blocking replay->start().
+        QTimer::singleShot(0, [dbc_name, this]() { loadDBCFromOpendbc(dbc_name.toString()); });
       }
     }
   }