Upgrade/Install: Fix Yoda condition in `wp_opcache_invalidate()`.

Fixes linting failure due to Yoda condition in `wp_opcache_invalidate()` following [48160].

See #36455.
Built from https://develop.svn.wordpress.org/trunk@48161


git-svn-id: https://core.svn.wordpress.org/trunk@47930 1a063a9b-81f0-0310-95a4-ce76da25c4cd