Support for multiple modules break single modules instations

[Cosik]

Hi I just updated packages and noticed that line udid = config_entry.data["module"]["udid"] broke my instance of this addon. I have only single module and get python key error no module.

[melkypie]

Readding (deleting and then adding the integration) seems to fix the issue, but still this shouldn't have to be the case. There should be some config migration that makes sure that configs are migrated to the new structure.