Fix config value name.

sphinx/builder.py

@@ -449,7 +449,7 @@ class StandaloneHTMLBuilder(Builder):
         self.info(bold('copying static files...'))
         ensuredir(path.join(self.outdir, 'static'))
         staticdirnames = path.join(path.dirname(__file__), 'static') + \
-                         self.config.static_path
+                         self.config.html_static_path
         for staticdirname in staticdirnames:
             for filename in os.listdir(staticdirname):
                 if not filename.startswith('.'):