Users: Make sure wp_logout() clears current user, so that a subsequent call to is_user_logged_in() works as expected.

Props sebastian.pisula, donmhico, roytanck, juliobox.
Fixes #35488.

git-svn-id: https://develop.svn.wordpress.org/trunk@46467 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/pluggable.php

@@ -571,6 +571,7 @@ if ( ! function_exists( 'wp_logout' ) ) :
 	function wp_logout() {
 		wp_destroy_current_session();
 		wp_clear_auth_cookie();
+		wp_set_current_user( 0 );
 
 		/**
 		 * Fires after a user is logged-out.