[netinstall] Leave the last status on the queue

- Reaching the end means there's no data, but leave the last load result
  (presumably bad-something) around rather than overwriting.

src/modules/netinstall/LoaderQueue.cpp

@@ -98,7 +98,6 @@ LoaderQueue::fetchNext()
 {
     if ( m_queue.isEmpty() )
     {
-        m_config->setStatus( Config::Status::FailedNoData );
         emit done();
         return;
     }