Revert back to 7.8 functionality so admin/editor can cancel editor's request

The 7.9 SCXML implementation introduced slightly different functional behavior as the requests menu is no longer available for admin (after rejecting a pending request from a editor), admin/editor can no longer remove a request started by the editor. This implies that the event also stays in the todo list until acknoledged by the editor.

In 7.8 the admin had the option to cancel the request and in effect remove it from the todo list

Steps to reproduce:
1) As author create a document and request publication
2) As editor/admin reject the publication
Functional change: no longer possible for the editor/admin to cancel the request
3) Go back to the dashboard as editor/admin
The document is still in the todo list, as 'rejection'
As the admin/editor no longer has the requests menu, no option possible to remove this items from the todo list, it can only be acted on by the editor.

Expected: If no action is possible or needed for the editor/admin the document must not be listed in the to-do list. Only if the admin has the option to drop(cancel) the request it can be shown.