ext/Intl: fix IntlListFormatter object error state after format() failures.

[LamentXU123]

This fixes:

<?php

$formatter = new IntlListFormatter('en_US');

var_dump($formatter->format(["\x80"]));         // bool(false)
var_dump($formatter->getErrorCode());           // int(0)
var_dump($formatter->getErrorMessage());        // string(12) "U_ZERO_ERROR"

var_dump(intl_get_error_code());                // int(10)
var_dump(intl_get_error_message());             // string(...) "IntlListFormatter::format(): Failed to convert string to UTF-16: U_INVALID_CHAR_FOUND"

Which is because IntlListFormatter doesn't pass error status to object but only to global status. Not yet found similar bugs.

Targeting 8.5 as IntlListFormatter is a new feature in 8.5.

To reproduce, see sandbox

[devnexen]

looks legit but I ll have a better look at this in the following days.