Change: update WEB to v3.4.1

* Fix [5501](https://github.com/owncloud/web/pull/5501): loading previews in the right sidebar
* Fix [5493](https://github.com/owncloud/web/pull/5493): view options position

https://github.com/owncloud/ocis/pull/2283
https://github.com/owncloud/web/releases/tag/v3.4.1