Fix reading left side bearings

[ren1244]

Some character render wrong position.

The image shows text rendering before fixing and after fixing.

Related specification documents

https://learn.microsoft.com/en-us/typography/opentype/spec/hmtx

If numberOfHMetrics is less than the total number of glyphs, then the hMetrics array is followed by an array for the left side bearing values of the remaining glyphs.

Testing code

using font：fonts.zip

<?php

require(__DIR__ . '/vendor/autoload.php');

use Dompdf\Dompdf;

$html = <<<EOT
<style>
    @font-face {
        font-family: "noto";
        src: url("fonts/NotoSerifTC-Regular.ttf") format('truetype');
        font-weight: normal;
        font-style: normal;
    }
    body{
        font-family: 'noto';
    }
</style>
<p>當一個有趣的人</p>
EOT;

$dompdf = new Dompdf([
    'chroot' => __DIR__
]);
$dompdf->loadHtml($html);
$dompdf->render();
$dompdf->stream('demo.pdf', [
    'Attachment' => 0
]);