Network Admin: Improve Site States in List Table rows.

This commit switches a comparison to a Yoda condition, performs a more strict `intval()` check on the value of the Site Status column, and prevents a specific Site State from appearing in List Table rows when filtering by that same Site State already (to match the behavior of other List Table State implementations.)

Fixes #37684. Props pbiron.
Built from https://develop.svn.wordpress.org/trunk@46441


git-svn-id: https://core.svn.wordpress.org/trunk@46239 1a063a9b-81f0-0310-95a4-ce76da25c4cd