Use project ID to check that the project is the same

[wonder-sk]

If a user gets db sync running with a project, then deletes the project and re-creates a new one with the same name, db sync will think it is still the previous project and things will break (e.g. it will try to download project version that does not exist).

We should make use of project IDs to make sure that we are still dealing with the same project or not...