Remove unused Cleanup() call

It was used to clean up shared memory.  We don't construct that anymore,
so remove the useless call.

Change-Id: I8087cef2afce184f66721a9995a63053fb278ec7
diff --git a/y2019/control_loops/drivetrain/replay_localizer.cc b/y2019/control_loops/drivetrain/replay_localizer.cc
index 93282c8..de28317 100644
--- a/y2019/control_loops/drivetrain/replay_localizer.cc
+++ b/y2019/control_loops/drivetrain/replay_localizer.cc
@@ -403,5 +403,5 @@
   ::y2019::control_loops::drivetrain::LocalizerReplayer replay;
   replay.ProcessFile(FLAGS_logfile.c_str());
 
-  ::aos::Cleanup();
+  return 0;
 }