Fix ability to authenticate with renewed username

[markmhendrickson]

My username markmhendrickson.id expired but remained listed in the "Choose username" modal during authentication. Having since re-purchased it, I'm unable to authenticate with any apps (e.g. https://app.sigle.io/, http://humans.name/).

The selection interaction for this username works in the popup, but then I see an error in the app's console after the popup closes automatically.

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