Bugfix: Add link in right sidebar sharing menu, doesn't copy link to clipboard

We've fixed a bug, where clicking the add link button in the right sidebar sharing menu,
created a new link but didn't copy it to the clipboard.

https://github.com/owncloud/web/pull/10573
https://github.com/owncloud/web/pull/10581
https://github.com/owncloud/web/issues/10563
