emails: fix invalid RCPT TO errors.

Fix `501 invalid RCPT TO address provided` errors caused by usernames
containing invalid characters. Example: `To: Foo,Bar <foobar@gmail.com>`.

app/mailers/application_mailer.rb

@@ -7,8 +7,7 @@ class ApplicationMailer < ActionMailer::Base
   default from: "#{Danbooru.config.canonical_app_name} <#{Danbooru.config.contact_email}>", content_type: "text/html"
 
   def mail(user, require_verified_email:, **options)
-    to = email_address_with_name(user.email_address&.address, user.name)
-    message = super(to: to, **options)
+    message = super(to: user.email_address&.address, **options)
     message.perform_deliveries = user.can_receive_email?(require_verified_email: require_verified_email)
     message
   end