Update Expectations of update method (#7119)

* Update Expectations of `update` method

Change `update` to return current state
when `shouldUpdate` returns false.

* Delete Accidental Tests

libs/common/src/platform/state/implementations/default-active-user-state.spec.ts

@@ -301,7 +301,7 @@ describe("DefaultActiveUserState", () => {
       await awaitAsync();
 
       expect(diskStorageService.mock.save).not.toHaveBeenCalled();
-      expect(result).toBe(undefined);
+      expect(result).toBeNull();
       expect(emissions).toEqual([null]);
     });