bug#51556: 29.0.50; Poor contrast of Customize SVG icons with dark backgrounds

[Eli Zaretskii]

> From: Kévin Le Gouguec <kevin.legouguec@gmail.com>
> Date: Mon, 01 Nov 2021 18:56:13 +0100
> 
> On darker themes (e.g. modus-vivendi), the Customize SVG icons
> (etc/images/right.svg and etc/images/down.svg) are not very visible, due
> to the poor contrast between their fill color (#2e3436) and dark
> backgrounds[1].

That's for the themes to resolve, isn't it?  They could supply their
own icons, because only they know which colors will go well with the
theme's colors.

So I don't think we should try solving this in general.