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/show.html.haml

@@ -56,7 +56,7 @@
                 = link_to @message.domain.name, [organization, @server, :domains], :class => "u-link"
               - else
                 Unknown Domain
-      - if @message.threat == 1
+      - if @message.threat
         %dl.messagePropertiesPage__property
           %dt Threat
           %dd= @message.threat_details
@@ -66,8 +66,8 @@
       - unless @message.received_with_ssl.nil?
         %dl.messagePropertiesPage__property
           %dt Transport Security
-          - if @message.received_with_ssl == 1
-            %dd.messagePropertiesPage__property--locked Received over a SSL connection
+          - if @message.received_with_ssl
+            %dd.messagePropertiesPage__property--locked Received over an SSL connection
           - else
             %dd Not received with SSL