fire and forget changeEmail in setDefaultEmailAddress

prevents blocking/erroring the change email workflow

services/web/app/coffee/Features/User/UserUpdater.coffee

@@ -112,7 +112,8 @@ module.exports = UserUpdater =
 				else if res.n == 0 # TODO: Check n or nMatched?
 					return callback(new Error('Default email does not belong to user'))
 				else
-					NewsletterManager.changeEmail oldEmail, email, callback
+					callback()
+					NewsletterManager.changeEmail oldEmail, email, ->