bodhi/backend: fix typo in the fedora-messaging consumer for the koji sync listener

The content variable is the one retrieved from the message bus
but we want to access the loaded JSON blob that is in the
body of the first comment.
So, let's use the proper variable.

Signed-off-by: Pierre-Yves Chibon <pingou@pingoured.fr>

roles/bodhi2/backend/files/koji_sync_listener.py

@@ -60,7 +60,7 @@ class KojiSyncListener(object):
             _log.info("Failed to decode JSON in the issue's initial comment")
             return False
 
-        package = content['repo']
+        package = body['repo']
         _log.info("Operating on {package}".format(package=package))
         sys.stdout.flush()