[Oracle] Don't report a cancelled card database update as successful (#7082)

* [Oracle] Don't report a cancelled card database update as successful (#3470)

Took 3 minutes

* [Oracle] Only report cancel when nothing was saved yet

Rejecting the wizard after SaveSetsPage or a download page already
wrote the database to disk still replaced cards.xml on disk, but
wasCancelled() forced exit code 1 so Cockatrice skipped the reload.
Track successful saves with OracleWizard::markDatabaseSaved() and only
treat a cancel as a failure when nothing was saved.

* [Oracle] Restore updater stderr in card update error dialog

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Co-authored-by: Lukas Brübach <Bruebach.Lukas@bdosecurity.de>

oracle/src/oraclewizard.cpp

@@ -128,12 +128,20 @@ void OracleWizard::accept()
 
 void OracleWizard::reject()
 {
+    cancelled = true;
+
     // The wizard is being closed while a page may still run a worker on the
     // importer. Ask it to stop before the wizard (and the importer child) is
     // destroyed, so the worker thread never touches freed memory.
     if (auto *active = dynamic_cast<OracleWizardPage *>(currentPage())) {
         active->cancelWork();
     }
+
+    const auto replies = nam->findChildren<QNetworkReply *>();
+    for (QNetworkReply *reply : replies) {
+        reply->abort();
+    }
+
     QWizard::reject();
 }