Setting restricted=true in the context macro should force executing the content

Right now, you also have to enable the execution of the content by other means (like setting transformationContext=DOCUMENT, but that does not make much sense when you don't actually indicate a document to switch to). Since only executing a given content in a restricted context without changing anything to the context is a pretty common use case, it should be made as easy as possible, which means just setting restricted=true.