[DataTable]: ItemsMap value saved incorrectly into localstorage while using settingsKey prop in Editable Tables

## Description

ItemsMap value saved incorrectly into localstorage. As a result, editable table brakes on attempt to restore usaved changes. Additionally, settingsKey could not be applied to such a form.

## Steps to Reproduce
1. Open [CodeSandbox example](https://codesandbox.io/p/sandbox/uui-forked-8w76l8?file=%2FExample.tsx%3A144%2C27).
2. Change editable table value in preview.
3. Reload preview.
4. Restore unsaved changes in preview.

## Actual result
Error "TypeError: value.items.set is not a function" appears.


## Expected result
Unsaved changes are restored.

## Environment

* UUI version: 5.13.3-rc.0
* Browser name: google chrome
* Operating System: Mac OS