Fix weird KDE bug with loginflowv2

It seems that KDE by default opens the url in secret.
Should fix: https://github.com/nextcloud/desktop/issues/1412

Signed-off-by: Roeland Jago Douma <roeland@famdouma.nl>

core/Service/LoginFlowV2Service.php

@@ -131,10 +131,6 @@ class LoginFlowV2Service {
 			return false;
 		}
 
-		if ($data->getStarted() !== 0) {
-			return false;
-		}
-
 		$data->setStarted(1);
 		$this->mapper->update($data);