Add referral code to promo email contributions (#3459)
Add referral code to promo email contributions (#3459)

* Add referral code to promo email contributions

Also the data in referral_downloads is not grouped and summed to get
the total confirmations for a region per code per day, so we do that on
our end. Previously we had too many rows in the report.

* Standardrb fix
brave/publishers,brave/publishers,brave/publishers