Fix #1466: Don't create a new user when primary email changes #1469
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When a user changes their primary email, without the
fxa_id
in the lookup, basket would query CTMS and get no response and treated this as a new user creating a new user in CTMS with the new email. By including thefxa_id
, we are able to find the user and process the oauth flow correctly, sending the user on to the prefs center.