Remove United States from all_fields merge tag

<?php
// http://www.gravityhelp.com/forums/topic/hide-united-states-when-address-type-of-us-is-selected#post-174604
// filter out United States from the all_fields merge tag
add_filter('gform_merge_tag_filter', 'remove_us', 10, 4);
function remove_us($value, $merge_tag, $options, $field){
    if($merge_tag == 'all_fields' && $field['id'] == '1') {
        $find = '#United States#';
        $replace = '';
        $removeus = preg_replace($find, $replace, $value);
        return $removeus;
    }
    else
        return $value;
}