add type annotation

Author: neverRare

src/local_storage.ts

@@ -1,6 +1,6 @@
 import { lazy } from "../misc/misc.ts";
 
-export const checkLocalStorage = lazy(() => {
+export const checkLocalStorage = lazy((): boolean => {
   // https://developer.mozilla.org/en-US/docs/Web/API/Web_Storage_API/Using_the_Web_Storage_API
   try {
     const x = "__storage_test__";