Deleting current revision on a page should generate document modified event

Steps to reproduce:

1. Setup a XWiki cluster with 2 servers
2. Create a new page with multiple revisions, example, 1.1, 2.1, 3.1..
3. Open this page on each server
4. On server 1 go to the History tab and delete the current revision
5. On server 2 refresh the page
6. The content on server 2 is still the old content which should be reverted to the pervious revision.