INTEG-307: [integ-ecms] No update in Content Activity when manually changing a content to Draft state


Problem analysis:
* When the publication state is changed manually to "draft" without any content update, there isn't any event fired.
  As a consequence, the new state isn't updated in Content Activity.

Fix description:
* When rendering a Content Activity, get the publication state directly from content's publication:currentState instead from Activity.