Preserve valid user IDs during key fix attempts

[martgil]

Automatic key fix attempts occur in renderPrvCompatFixUiAndWaitTilSubmittedByUser(), but they are too aggressive, removing all user IDs instead of only the invalid or null ones.

The overly aggressive key fix issue affects [general-mail-formatter.ts:L45](https://github.com/FlowCrypt/flowcrypt-browser/blob/4c4919346112499dd90d9c4b29489265926580ba/extension/chrome/elements/compose-modules/formatters/general-mail-formatter.ts#L45). If a user has multiple email aliases, valid user IDs may be incorrectly removed during a key update attempt.

Reference: https://mail.google.com/mail/u/human@flowcrypt.com/#inbox/FMfcgzQZTgTgjRmZvRqdnWxpGrnQwQjv