revert default fetch handler

static_src/WebStorage.ts

@@ -20,7 +20,7 @@ export default class WebStorage {
      * @param {import('@twurple/auth').AuthProvider} auth_provider used to add the authentication header to requests for web storage
      * @param {fetch} fetch defaults to `globalThis.fetch`, allows you to further customize fetch behavior via chaining, for example with `fetch-retry`
      */
-    constructor(auth_provider: import('@twurple/auth').AuthProvider, fetch: typeof globalThis.fetch = globalThis.fetch, origin?: string) {
+    constructor(auth_provider: import('@twurple/auth').AuthProvider, fetch: typeof globalThis.fetch = (input, init) => globalThis.fetch(input, init), origin?: string) {
         this.#fetch = fetch
         this.#auth_provider = auth_provider
         auth_provider.getAccessTokenForUser(undefined)