[local-sync] Don't be so strict about updating threads from messages
[local-sync] Don't be so strict about updating threads from messages

This is how we _add_ messages to a thread in the first place, so we cannot
place the constraint that the thread must contain the message already.

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