Bug: If adding a 2nd Gmail email, the verification email gets sent to one's 1st address

To reproduce: Create an account with a Gmail address. Then go to https://talkyard-server/-/users/the-username/preferences/account and connect a 2nd Gmail address. The verification email, to check that this addr works, gets sent to the first and primary email address, rather to the new 2nd address.

(Note to self: Add 2nd addr over at https://beautiful.demo.talkyard.io to extra test this, later.)