XWIKI-8599: Object Editor displays unrendered HTML as property value for objects that contain users/groups list field displayer
* Don't render the value of the first object field in the object 'title'. Show the first 120 characters of the first line of its raw value instead.
(cherry picked from commit 7cb7925ba0b5c343d00dfbfb7fd9fc195020c6d8)