[Vantage] Change Custom-Forms sanitization method for textarea fields

functions.php

<?php

function childtheme_custom_forms_textarea_sanitize( $form, $form_id ) {

	foreach ( $form as $key => $field ) {
		if ( 'textarea' == $field['type'] ) {
			$form[ $key ]['sanitize'] = 'wp_kses_post';
		}
	}

	return $form;
}
add_filter( 'appthemes_get_custom_form_fields', 'childtheme_custom_forms_textarea_sanitize', 10, 2 );