Disable successful scheduled export notification

[realityexists]

First, thanks for the simple open source backup app!

I have SMS IE 2.4.1 scheduled to export daily and it causes an Android notification every morning, which is a completely unnecessary annoyance. Yes, it's just one notification per day, but it's something I have to dismiss every single day! Could you please add an option to disable it, i.e. just do the scheduled export silently as long as it succeeds?

I realise that I can disable scheduled export notifications in Android settings for the app, but I'm afraid that will also disable notifications on failure, and I still want to be notified if it fails.

[tmo1]

Duplicate of #34

[tmo1]

First, thanks for the simple open source backup app!

You're very welcome!

I realise that I can disable scheduled export notifications in Android settings for the app, but I'm afraid that will also disable notifications on failure, and I still want to be notified if it fails.

Hm. I had thought that we had split scheduled export success and failure notifications into separate channels as part of PR #187, but apparently we did not. That should be a simple extension of the changes in that PR, though.