emails: fix invalid email address deletion script.

Fix script to delete all invalid email addresses. In production there
were ~4000 users with invalid email addresses because we used to not do
any validation of emails during signup.

script/fixes/067_delete_invalid_email_addresses.rb

@@ -3,5 +3,5 @@
 require_relative "../../config/environment"
 
 EmailAddress.transaction do
-  EmailAddress.where("address !~ ? AND address !~ ?", "@", "\\.").count
+  EmailAddress.valid(false).destroy_all
 end