Hook meta setup on rest_api_init to ensure called for tests

Author: adamsilverstein

src/wp-includes/comment.php

@@ -4135,4 +4135,4 @@ function wp_create_initial_comment_meta() {
 		)
 	);
 }
-add_action( 'init', 'wp_create_initial_comment_meta' );
+add_action( 'rest_api_init', 'wp_create_initial_comment_meta' );