Update the `data-wp-interactive` directive in the loading bar from `core/router` to `core/router/private` so that internal navigation state properties (`hasStarted`, `hasFinished`) are not exposed as part of the public `core/router` store API. Props westonruter. Fixes #64647. Built from https://develop.svn.wordpress.org/trunk@61653 git-svn-id: http://core.svn.wordpress.org/trunk@60964 1a063a9b-81f0-0310-95a4-ce76da25c4cd