[local-sync] Don't filter contacts w/out emails out of To/From/Cc/Bcc fields
[local-sync] Don't filter contacts w/out emails out of To/From/Cc/Bcc fields

We separately filter out contacts without email addresses before
committing to the contacts table in the database for autocomplete (in
isContactMeaningful()), and if we filter out these already we can end up
excluding legitimate elements of the headers. For example, the Clutter
feature of Office 365 sends emails with a From: header like this:

From: Microsoft Outlook

Fixes: T7413

nylas-mail-lives/nylas-mail,nylas/nylas-mail,simonft/nylas-mail,nylas/nylas-mail,nirmit/nylas-mail,nylas-mail-lives/nylas-mail,nylas/nylas-mail,nylas-mail-lives/nylas-mail,simonft/nylas-mail,simonft/nylas-mail,nirmit/nylas-mail,nylas/nylas-mail,nylas/nylas-mail,nylas-mail-lives/nylas-mail,simonft/nylas-mail,nirmit/nylas-mail,nirmit/nylas-mail,nylas-mail-lives/nylas-mail,nirmit/nylas-mail,simonft/nylas-mail