Consistently treat tinyint(1) fields in message database as booleans (#2380)

* Update mysql2 query call to cast booleans

* Treat messages:held field as boolean

* Treat messages:inspected field as boolean

* Treat messages:spam field as boolean

* Treat messages:threat field as boolean

* Treat messages:bounce field as boolean

* Treat messages:received_with_ssl field as boolean

* Treat deliveries:sent_with_ssl field as boolean

script/insert-bounce.rb

@@ -30,6 +30,6 @@ message.scope = "incoming"
 message.rcpt_to = "#{server.token}@#{Postal.config.dns.return_path}"
 message.mail_from = "MAILER-DAEMON@smtp.infra.atech.io"
 message.raw_message = template
-message.bounce = 1
+message.bounce = true
 message.save
 puts "Added message with id #{message.id}"