update leaderboard text fg color

frontend/lib/provider/quote_provider.dart

@@ -211,13 +211,11 @@ class QuoteProvider extends ChangeNotifier {
   Color getLeaderboardEntryFgColor(BuildContext context, int index) {
     switch (index) {
       case 0:
-        return Colors.black; // 1st place
       case 1:
-        return Colors.black;   // 2nd place
       case 2:
-        return Colors.black;  // 3rd place
+        return Colors.black;
       default:
-        return Colors.white; // default for all other entries
+        return Theme.of(context).textTheme.bodyMedium!.color!;
     }
   }
 }