fixed cut and paste error, thanks Martin

VERSION

@@ -1 +1 @@
-Version 2.00.0 (2012-08-20 21:56:23) dev
+Version 2.00.0 (2012-08-21 07:57:05) dev

gluon/tools.py

@@ -2641,8 +2641,7 @@ class Auth(object):
         return form
 
     def is_impersonating(self):
-        def is_impersonating(self):
+        return self.is_logged_in() and 'impersonator' in current.session.auth
-            return self.is_logged_in() and 'impersonator' in current.session.auth
 
     def impersonate(self, user_id=DEFAULT):
         """