fix: Wrong escaping in 'class-wp-nav-menu-widget.php' file

[hz-tyfoon]

Trac ticket: 56128

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[github-actions]

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[hz-tyfoon]

Sorry. Just updated the PR.
Looks like it wasn't "wrong escaping". So, added inline comment to explain why 'esc_attr()' used there instead of 'esc_url()'.
Thanks @SergeyBiryukov

[SergeyBiryukov]

Thanks for the PR! Merged in r53630.