Operation 'Services.UntagDocument' only works if the tag being removed was added on the document by the current user

It is not possible to remove a tag using operation Services.UntagDocument if the user running the operation is not the one who added it to the document.

How to reproduce:

• In studio, create a user action of type Contextual tools running the following automation chain and deploy it:

  - Context.FetchDocument
  - Services.UntagDocument:
      tags: tag1
  

• log in as user1 and add tag tag1 on a document
• log in as user2, navigate to the same document and click on the user action previously created (which should remove tag tag1)

Tag tag1 is not removed, but using the Nuxeo UI, user user2 can remove the tag.