don't use self.__class__ with super()

I also thought this was clever, but I was wrong... oh so wrong...

http://www.reddit.com/r/Python/comments/977eo/protip_stop_hardcoding_the_class_name_when_using/c0bo068

debug_toolbar_mongo/panel.py

@@ -12,7 +12,7 @@ class MongoDebugPanel(DebugPanel):
     has_content = True
 
     def __init__(self, *args, **kwargs):
-        super(self.__class__, self).__init__(*args, **kwargs)
+        super(MongoDebugPanel, self).__init__(*args, **kwargs)
         operation_tracker.install_tracker()
 
     def process_request(self, request):