Use radio icon as cover art when playing

[kkalvaa]

Is your feature request related to a problem? Please describe.
I find it a little hard to quickly identify what's playing when playing radio and the "cover" is the radio icon (screenshot 1).

Describe the solution you'd like
I wish the radio stream art/icon be shown as the cover art instead of the little radio icon (screenshot 2).

Describe alternatives you've considered
An alternative could be to show the cover art of the currently playing song for radio streams that provide that info, but not all do.

Additional context

Screenshot 1, current view:

Screenshot 2, proposed view:

[hifiberry]

We're open to contributions here, but we won't work on this.