Update node via node-object instead of using SQL in _content_moderation_set_live

The function _content_moderation_set_live updates the node via SQL instead of updating direct a node object like:

$node = node_load($nid, NULL, true);
$node->status = 1;
$node->.....
.....
.....
node_save($node);

This behavior prevents the Rules Module from trigger some events such as "After updating existing content".