editorWidget.border fixed (#141)

Renamed the invalid key `editorWidgetBorder` to the valid `editorWidget.border` key. The invalid key was never in the VS Code code base so it must be a typo or attention error.

Author: chris78er

themes/nord.json

@@ -32,7 +32,7 @@
     "editorLineNumber.activeForeground": "#d8dee9",
     "editorWhitespace.foreground": "#4c566ab3",
     "editorWidget.background": "#2e3440",
-    "editorWidgetBorder": "#3b4252",
+    "editorWidget.border": "#3b4252",
     "editor.background": "#2e3440",
     "editor.foreground": "#d8dee9",
     "editor.hoverHighlightBackground": "#3b4252",