Fix "Free space on disk" in new torrent dialog

Always initialize it.

src/gui/addnewtorrentdialog.cpp

@@ -991,10 +991,10 @@ void AddNewTorrentDialog::TMMChanged(int index)
 
         m_ui->groupBoxDownloadPath->blockSignals(true);
         m_ui->groupBoxDownloadPath->setChecked(!downloadPath.isEmpty());
+    }
 
     updateDiskSpaceLabel();
 }
-}
 
 void AddNewTorrentDialog::doNotDeleteTorrentClicked(bool checked)
 {