`b4 prep --manuall-reroll` + `b4 send --resend` doesn't work as expected

[tamird]

I ran into an issue sending a large series with lots of recipients: I hit the gmail quota and couldn't finish sending it. So I used b4 prep --manuall-reroll so that I could correctly tag the next attempt as RESEND.

Unfortunately the original recipient list was not pulled into the tag, so b4 send --resend produced a much smaller list of recipients.

I had to manually edit the sent/.... tag to add the recipient list and then b4 send --resend did the right thing.

[tamird]

I reported a related problem here. The solution there would be the same: manually edit the tag.