[KPhotoAlbum] Patch: allow to show thumbnails on black background

[Henner Zeller]

Hi,

> I also made selection more visible by changing the background color of
> selected thumbnails. Previous selection style had a quite low contrast
> sometimes, especially when selected image was same color as the
> highlight color (light blue on my system).
>
> KPA-SVN users: Any comments on new selection graphics?

Looks better than before!

Thanks,
  -henner