Cover image also picking from `html_logo`

[sachin-suresh-rapyuta]

The cover image appears twice. One from html_logo which should ideally render only in HTML page and also from the cover-bg defined in the simplepdf_vars.

This is what I have in conf.py:

html_logo = "_static/rr-logo-vertical2022-1100px-transp.png"

simplepdf_vars = {
    'cover-bg': 'url(rr-logo-vertical2022-1100px-transp.png) no-repeat center',
}

If I comment html_logo, there is no logo on HTML. But curious why PDF is picking images from the html_logo element.