Mark LoadJob as transient

Avoids a "Loading archive (finished)" remaining in notification history

kerfuffle/jobs.cpp

@@ -232,6 +232,8 @@ LoadJob::LoadJob(Archive *archive, ReadOnlyArchiveInterface *interface)
     , m_dirCount(0)
     , m_filesCount(0)
 {
+    // Don't show "finished" notification when finished
+    setProperty("transientProgressReporting", true);
     qCDebug(ARK) << "Created job instance";
     connect(this, &LoadJob::newEntry, this, &LoadJob::onNewEntry);
 }