Fix OEmbedIframeController hash creation

Problem/Motivation

Using oEmbed Media with empty height or width values shows error page instead media
This is due a difference in the hash created by this module vs. how core generates the hash.

https://api.drupal.org/api/drupal/core%21modules%21media%21src%21Control... uses the following code to determine the hash:

    $max_width = $request->query->getInt('max_width');
    $max_height = $request->query->getInt('max_height');

    // Hash the URL and max dimensions, and ensure it is equal to the hash
    // parameter passed in the query string.
    $hash = $this->iFrameUrlHelper->getHash($url, $max_width, $max_height);

This means even if one of these values is "NULL" / empty it will use 0 as value to calculate the hash.
However

• https://git.drupalcode.org/project/varbase_media/-/blob/37c9dfba36cde820...
• https://git.drupalcode.org/project/varbase_media/-/blob/37c9dfba36cde820...

don't do any casting.
This can lead to inconsistencies when creating the hash and hence access denied responses from \Drupal\media\Controller\OEmbedIframeController::render().

Proposed resolution

At this moment I've no better idea than casting the width / height values when calling \Drupal\media\IFrameUrlHelper::getHash().
Even thought \Drupal\media\Plugin\Field\FieldFormatter\OEmbedFormatter::viewElements itself doesn't do this. Which might be an inconsistency that should be addressed there.