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

app/views/messages/activity.html.haml

@@ -41,5 +41,5 @@
         %p.messageActivity__extra
           - if @message.credential
             Received using the #{@message.credential.name} #{@message.credential.type} credential.
-          - if @message.received_with_ssl == 1
+          - if @message.received_with_ssl
             Connection secured with SSL.