Beautifying the nocover image in the currenttrack applet

[Nikolaj Hald Nielsen]

> Yeah, there seem to be an issue with several of these borders
> sometimes being painted on top of each other. I have not had time to
> look into it yet, but my guess would be that we somehow cache the
> image with the border and then re-apply the border and cache it
> again...

And this is now fixed in trunk! :-D

- Nikolaj