Merge pull request #103 from ajitid/patch-2

Enable group borders in Quick Picker dropdown again

The separators have been disabled in the first place because it made the whole drop-down look divided and broken into multiple pieces and a bit cluttered instead of smooth transitions into the next section. It was still distinguishable through the names of the labels on the right. However, it was hard to see which item on the left is on the same level as the label to immediately determine what the next item's group.
This has been change by enabling the borders again for better visual distinction.

Closes GH-100

themes/nord.json

@@ -149,7 +149,7 @@
     "peekViewTitle.background": "#3b4252",
     "peekViewTitleDescription.foreground": "#d8dee9",
     "peekViewTitleLabel.foreground": "#88c0d0",
-    "pickerGroup.border": "#3b425200",
+    "pickerGroup.border": "#3b4252",
     "pickerGroup.foreground": "#d8dee9",
     "progressBar.background": "#88c0d0",
     "scrollbar.shadow": "#00000066",