Update Seznam.cz search engine icon, or not?

Hi.

One of search providers (Seznam.cz) included in Firefox for Android has
changed the icon they use for touch devices. Instead of a white "S" on
red background (here
<https://transvision.mozfr.org/productization/?locale=cs&product=mobile>),
they now have red "S" on white background (here
<https://www.seznam.cz/media/img/seznam-icons/apple-touch-icon-180x180.png>).
It means the color scheme is now consistent with their favicon and
desktop icon, however IIRC correctly white background is not good in the
Firefox mobile interface.

What is the best reaction on this change? Should we keep the current
icon (red background), switch to the new one (white background), or ask
Seznam.cz to decide, what icon they prefer to have in Firefox?

Cheers,

-- 
Michal