XenForo How to remove the letter Z from avatars?

[Dkf]

If a user does not have an avatar, the forum generates an avatar with the letter Z.
How to avoid this?

I modified the template, but for some reason, it's not working. Please help.

PAGE_CONTAINER
Code:

<xf:js>
<script>
$(document).on('ready', function()
{
$('.avatar span[role=img][aria-label^="Z"]')
    .text('Y')
});
</script>
 </xf:js>
 </head>

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