Rename config.json to aos_config.json

Plenty of other things are called config.json, so let's pick a more
unique name.

Change-Id: I6510a172ec62674dd1b11bd71cef9aac2480c612
Signed-off-by: Austin Schuh <austin.linux@gmail.com>
diff --git a/y2020/control_loops/drivetrain/drivetrain_replay.cc b/y2020/control_loops/drivetrain/drivetrain_replay.cc
index 40b50ed..d2f2880 100644
--- a/y2020/control_loops/drivetrain/drivetrain_replay.cc
+++ b/y2020/control_loops/drivetrain/drivetrain_replay.cc
@@ -19,7 +19,7 @@
 #include "y2020/control_loops/drivetrain/localizer.h"
 #include "y2020/control_loops/superstructure/superstructure.h"
 
-DEFINE_string(config, "y2020/config.json",
+DEFINE_string(config, "y2020/aos_config.json",
               "Name of the config file to replay using.");
 DEFINE_string(output_folder, "/tmp/replayed",
               "Name of the folder to write replayed logs to.");