Update disqus_static.py

There is no '_' prefix for DEFAULT_CONFIG

disqus_static/disqus_static.py

@@ -10,9 +10,9 @@ from disqusapi import DisqusAPI, Paginator
 from pelican import signals
 
 def initialized(pelican):
-    from pelican.settings import _DEFAULT_CONFIG
-    _DEFAULT_CONFIG.setdefault('DISQUS_SECRET_KEY', '')
-    _DEFAULT_CONFIG.setdefault('DISQUS_PUBLIC_KEY', '')
+    from pelican.settings import DEFAULT_CONFIG
+    DEFAULT_CONFIG.setdefault('DISQUS_SECRET_KEY', '')
+    DEFAULT_CONFIG.setdefault('DISQUS_PUBLIC_KEY', '')
     if pelican:
         pelican.settings.setdefault('DISQUS_SECRET_KEY', '')
         pelican.settings.setdefault('DISQUS_PUBLIC_KEY', '')