Add more contrast to side panel active item

[bmadone]

I think it would be better if the contrast for icons were brighter

[fspoettel]

duplicate of #156?

[fspoettel]

fwiw, you can try customizing this as described here.

I use this to get around the problem:

  "workbench.colorCustomizations": {
    "[Nord]": {
      "list.activeSelectionIconForeground": "#2e3440",
    }
  }

[bmadone]

@fspoettel thanks, it just what I need