Editing an existing relationship type to add an 'implies' creates incorrect row in DB

Edit an existing type, and add an "implies". The row that's added to the user_relationship_implications will have 0 in the rtid column. This is because the &$form_values parameter that's passed to user_relationship_implications_edit_submit() is structured differently when you're editing an existing type than it is when you're adding a new type. [I don't know why it's structured differently, but it is.]

I've attached a patch which fixes the problem.