Drop un-used topic

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

mirror_from_pagure_bus.py

@@ -82,8 +82,6 @@ class MirrorFromPagure(object):
             if repo_name not in self.trigger_names:
                 _log.info("%s is not a pagure repo of interest, bailing", repo_name)
                 return
-        elif message.topic == "org.fedoraproject.prod.infragit.receive":
-            pass
         else:
             _log.info("Unexpected topic received: %s", message.topic)
             return