OAuth: Unify error behavoior of refresh and and initial auth

[TheOneRing]

desktop/src/libsync/creds/oauth.h

Line 89 in 02349e4

void result(OAuth::Result result, const QString &token = QString(), const QString &refreshToken = QString());

desktop/src/libsync/creds/oauth.h

Line 154 in 02349e4

void refreshError(QNetworkReply::NetworkError error, const QString &errorString);

[TheOneRing]

Related: #310

[github-actions]

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