Privacy: Add a setting to disable comment cookie consent.

Fixes #44373.

git-svn-id: https://develop.svn.wordpress.org/trunk@43469 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-admin/includes/schema.php

@@ -535,6 +535,9 @@ function populate_options() {
 
 		// 4.9.6
 		'wp_page_for_privacy_policy'      => 0,
+
+		// 4.9.8
+		'show_comments_cookies_opt_in'    => 0,
 	);
 
 	// 3.3