Close wizard if done

This is needed because of the changes in 02bb5db544

Signed-off-by: Felix Weilbach <felix.weilbach@nextcloud.com>

src/gui/owncloudsetupwizard.cpp

@@ -684,6 +684,7 @@ void OwncloudSetupWizard::slotAssistantFinished(int result)
     }
 
     // notify others.
+    _ocWizard->done(QWizard::Accepted);
     emit ownCloudWizardDone(result);
 }