Undoing removal of default columns on Users page

Some of the default columns in the Users section of WordPress were removed with this code:

function remove_users_columns( $columns ) {

    unset( $columns['posts'] );
    unset( $columns['name'] );

    return $columns;
}
add_filter( 'manage_users_columns', 'remove_users_columns' );

I’ve searched far and wide to undo the removal of columns but have come up short. Lend a hand?