Follow-up to https://github.com/zed-industries/zed/pull/37489 Notification panel settings were always missing the content, hence this PR adds it. After #37489, the use of the same content twice broke things, which currently makes the notification panel non-configurable on Nightly. This PR fixes this. There once was an issue about the documentation for the panel being wrong as well. However, I was just unable to find that sadly. Release Notes: - N/A