Move to Publishing Options group

I suggest moving the checkbox option on the node add and edit screens to the "Publishing Options" fieldset instead of having its own "Restricted Search" one.

Because this node acts as another publishing option, that grouping makes more sense. And this would simplify the user interface on those pages for content writers and editors.

To implement, this would simply mean changing the two lines for $form['search_block_set'] to $form['options'] and removing the original group.