Tumbleweed: Contrast issues with trash icon on KDE Plasma with the new light background

[lkocman]

People with Color vision deficiency might will have a problem with contrast of trash icon and the background

https://openqa.opensuse.org/tests/4537665#step/updates_packagekit_kde/1

If we intend to keep the background color (which is what I hope for) we need to get more contrasting color for the trash and similar icons.

[lkocman]