Remove stale TODO.

src/components/SearchableList.tsx

@@ -10,7 +10,6 @@ interface ListProps<Item> {
   map: { [key: string]: Item };
 }
 
-// TODO: Add search box.
 const SearchableList: FC<ListProps<Item>> = ({ component, map }) => {
   const [filter, setFilter] = useState<string>("");