fix: update keystore nullish check

frontend/test/setup.ts

@@ -1,17 +1,8 @@
 import "@testing-library/jest-dom";
-import { IDBFactory } from "fake-indexeddb";
+import "fake-indexeddb/auto"; // auto configures the indexedDB
 import { afterAll, afterEach, beforeAll } from "vitest";
 import { server } from "./mocks/server";
 
-/**
- * faking indexeddb in memory for testing crypto key storage
- */
-Object.defineProperty(globalThis, "indexedDB", {
-  value: new IDBFactory(),
-  writable: true,
-  configurable: true,
-});
-
 beforeAll(() => server.listen({ onUnhandledRequest: "warn" }));
 afterEach(() => server.resetHandlers());
 afterAll(() => server.close());