Bring back for saving usernames as well
While this also reintroduces that a password field is used for entering, this is better than asking for the username every time, which is a regression compared to 5.18. Using a proper username input field would need changes in kwidgetsaddons or some refactoring to ask for username and password at once. Drop use of wallet->readEntry - it's custom binary data, so the content is entirely defined by whoever wrote it. We don't use writeEntry here, so using readEntry is invalud.
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