Avoid "auto disable" button logic for new message form

tailbone/views/messages.py

@@ -182,6 +182,9 @@ class MessagesView(MasterView):
     def configure_form(self, f):
         super(MessagesView, self).configure_form(f)
 
+        # we have custom logic to disable submit button
+        f.auto_disable = False
+
         # TODO: A fair amount of this still seems hacky...
 
         f.set_renderer('sender', self.render_sender)