Add widget controls with an initially-true `active` state so that calling `expand()` will not be short-circuited. Previously the `active` state would be set once the preview refreshes, but this happens too late for the `addWidget` call. Fixes regression introduced in [35231].
Fixes#34514.
git-svn-id: https://develop.svn.wordpress.org/trunk@35486 602fd350-edb4-49c9-b593-d223f7449a82