bug: stop button in queue remove blue color from active song

[waves]

In the queue the active songs has blue background. Clicking stop when in playback window stops without removing the blue background from active song in queue. But clicking stop when in queue windows stops *and* removes the blue color. It shouldn't.

[ACX]

The UI code is under a deep refactoring, so this behaviour will probably change in the future. Thank you for the feedback!