## Description
When switching a view's visibility from WORKSPACE to UNLISTED, the code
in `view-v2.service.ts` correctly sets `createdByUserWorkspaceId` to the
current user (to prevent the view from disappearing). However, this
property was not included in `FLAT_VIEW_EDITABLE_PROPERTIES`, which
meant:
1. The comparison logic didn't detect the change
2. No update action was created for the property
3. The value was never persisted to the database
4. The view disappeared because it became UNLISTED with no owner
This fix adds `createdByUserWorkspaceId` to the editable properties so
the change is properly detected and persisted.
Might fix https://github.com/twentyhq/twenty/issues/15955
