Moved `#content` to the outermost div on the template. Refs #217, #271.

This puts `bh_ticket.html` in line with other templates in Trac and Bloodhound, and results in the ticket comment textarea having monospace font.

git-svn-id: https://svn.apache.org/repos/asf/bloodhound/trunk@1512473 13f79535-47bb-0310-9956-ffa450edef68