[odrs-web] Fix traceback when printing a OdrsUser

[Richard Hughes <rhughes src gnome org>]

commit ac9450244dbd1b587ef59a1fbdd04ffdcaa86cc7
Author: Richard Hughes <richard hughsie com>
Date:   Tue Sep 27 12:04:11 2016 +0100

    Fix traceback when printing a OdrsUser

 user.py |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/user.py b/user.py
index e0e1710..2897c57 100644
--- a/user.py
+++ b/user.py
@@ -28,4 +28,4 @@ class OdrsUser(object):
         return str(self.id)
 
     def __repr__(self):
-        return '<User %r>' % (self.nickname)
+        return '<User %r>' % (self.id)