Export all contacts feature broken

[seisvelas]

ref: https://mail.google.com/mail/u/human@flowcrypt.com/#inbox/FMfcgzGkXSTdrbjTDpCcDmDRkPpnBsfh

I found one bug about the export contact. I click export all contact but seem like file size is 0 byte.

I tried this myself and the same happens. I click FlowCrypt Settings -> Additional Settings -> Contacts -> export all, it downloads a file, I open it, aannnd, empty!

When we patch this, we should also add a test to prevent this from popping up again in the future.

If anyone knows something obvious that's causing this let me know, otherwise just feel free to assign this to me and I'll start debugging it.

[github-actions]

There were 1 email addresses found in the above comment. Please:

1. click three dots -> edit to remove the email addresses
2. click edited in the comment header, and click on the previous revision of the comment
3. when viewing the old revision with an email in it, click options -> delete this revision from history

[tomholub]

Agree with added test