Atomic permission should be returned by BasePermissionsJsonEnricher

1. in Studio create a document type mydoctype
2. in the edit layout add the following:

       <nuxeo-connection id="myconn" user="{{currentUser}}"></nuxeo-connection>
       
           <dom-if if="[[_hasPermission(document, 'ReadWrite')]]">
         <template>
           aaaa
         </template>
       </dom-if>
   

3. add the following function in the Polymer script section:

   ,
         _hasPermission(document, perm) {
           const permissions = this.document && this.document.contextParameters && this.document.contextParameters.permissions;
           console.log(permissions);
           console.log(this.currentUser);
   
           return permissions && permissions.indexOf(perm) !== -1;
         }
   

4. synch the project the project with the server
5. create a document of type mydoctype
6. create a user named robert
7. give ReadWrite permission to user robert using the UI
8. give WriteSecurity permission to user robert using the following curl (adapt it to match the document id of your environment):

   curl -s -u Administrator:Administrator -X POST -H 'Content-Type: application/json' -d '{"params":{"username":"robert","email":null,"permission":"WriteSecurity","begin":null,"end":null,"notify":false,"comment":""},"context":{},"input":"41e40a83-8afc-4903-ae9c-280facc1818b"}' http://localhost:8080/nuxeo/api/v1/automation/Document.AddPermission
   

9. refresh the UI
10. double-check the WriteSecurity permission is present (see assignedPermissions.png)
11. click the edit button
12. observe the string aaaa is displayed (see visibleText.png)
13. now modify the layout by replacing ReadWrite with WriteSecurity:

    <dom-if if="[[_hasPermission(document, 'WriteSecurity')]]">
    

14. synch the project
15. click the edit form
16. observe the string aaaa is not displayed
17. after some debugging it seems the WriteSecurity is not retrieved (see debuggedPermissions.png)

Expected behavior: all the permissions should be fetched to use them when needed.