Merge pull request #308501 from bbenno/fix-vcv-rack

pkgs/applications/audio/vcv-rack/default.nix

···
     # no-derivatives clause
     license = with licenses; [ gpl3Plus cc-by-nc-40 unfreeRedistributable ];
     maintainers = with maintainers; [ nathyong jpotier ddelabru ];
+    mainProgram = "Rack";
     platforms = platforms.linux;
   };
 }