Let acting on the status potentially set the close_status and vice versa
    
    This way, making a closed ticket 'Open' will reset its close_status and
    giving a 'close_status' to an open ticket will close it.
    
    Fixes https://pagure.io/pagure/issue/2358
    Fixes https://pagure.io/pagure/issue/2192
    
    Signed-off-by: Pierre-Yves Chibon <pingou@pingoured.fr>