fix escaping when replying to inbox items, fixes #3908

Change-Id: I935601cd2aac4537cfba0cd4b68248c738d836ec
Reviewed-on: https://gerrit.instructure.com/2434
Reviewed-by: Brian Palmer <brianp@instructure.com>
Tested-by: Hudson <hudson@instructure.com>

public/javascripts/context_messages.js

@@ -569,7 +569,7 @@ var messages = {
       data: message,
       id: 'context_message_' + message.id,
       hrefValues: ['user_id', 'recipient_id', 'id'],
-      htmlValues: ['formatted_body', 'subject']
+      htmlValues: ['formatted_body']
     });
     for(var idx in message.attachments) {
       var attachment = message.attachments[idx].attachment;