Reopen `AddRepoWindow` prefilled on failure.

[chriscn]

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The problem

I ran into several problems when setting up, which I'll describe in a separate issue as it could be a quirk of my installation. However the most frustrating thing was when the repo creation failed it would lose all my repo settings.

I had to reenter my details nine times due to errors, including my path, repo key, and --remote-path=borg1

Requested Solution

Repository settings should be saved, the Start Backup button should be grayed out until that the checks have completed.

[m3nu]

Adding the repo needs to succeed before it's added, since we pull in details like size and archives. We can't have it "half added".

[real-yfprojects]

Maybe we could reopen the repo add dialog with the same contents when adding the repo fails?

[chriscn]

Maybe we could reopen the repo add dialog with the same contents when adding the repo fails?

I think that’s a good idea.

[shivansh02]

Should it be prefilled after vorta is restarted or just for the session?

[real-yfprojects]

Should it be prefilled after vorta is restarted or just for the session?

Just for the session imo.