remove unused arduino.foreground color

Author: francescospissu

arduino-ide-extension/src/browser/arduino-frontend-contribution.tsx

@@ -201,16 +201,6 @@ export class ArduinoFrontendContribution
         description:
           'Secondary branding color for list selections, dropdowns, and widget borders.',
       },
-      {
-        id: 'arduino.foreground',
-        defaults: {
-          dark: 'editorWidget.background',
-          light: 'editorWidget.background',
-          hc: 'editorWidget.background',
-        },
-        description:
-          'Color of the Arduino IDE foreground which is used for dialogs, such as the Select Board dialog.',
-      },
       {
         id: 'arduino.toolbar.button.background',
         defaults: {