Modify organisation_state in search index for closed and devolved organisations

We want to hide the [closed organisation] text in search results for organisations marked as closed and devolved. In order to so, we return "live" if an organisation is closed and devolved. A fix involving properly modelling devolved status is planned in the future. 

Please see: https://www.agileplannerapp.com/boards/105200/cards/6007 for more background of the story.