Add TBD of where the Income duplicate name validator is going wrong.

lib/pages/tracked_item.dart

@@ -337,6 +337,7 @@ class _TrackedItemInputDialogState extends State<TrackedItemInputDialog> {
                 : Text("Edit ${_type!.title}"),
           ),
           content: FutureBuilder<List<Expense>>(
+              // TODO / TBD -- This should no longer only be Expenses.
               future: DatabaseHelper.instance.getExpenses(),
               builder: (BuildContext context,
                   AsyncSnapshot<List<Expense>> snapshot) {