Enabling Auto update on an extension is not persisted

[sandy081]

Steps to Reproduce:

1. Disable Extension Auto Updates (Set to None)
2. Install an extension
3. Enable Auto Update All (From Publisher) of that extension.
4. From the CLI: Install an older version of that extension code-insider install-extension <pub.name@old-version>
5. Open the extension in the editor and see Auto Update checkbox is disabled
6. Enable the Auto Update, close and reopen the editor

🐛 checkbox is disabled.