#1056 highlight palette colour for current track and playlist

[burak]

I use the great and only qt5ct to theme my (Fluxbox) system and naturally I prefer its colour scheme to be applied in

Qmmp Settings > Appearance > Colours : Playlist Colors (√ Use system colors)

Yet when I do this it's almost impossible to see/differentiate both the currently playing track in the playlist window and the current playlist in the side pane (please see the screenshot). It would be very fine to have both default to the highlight palette colour for instance.