Report MPC horizon and drop any cycles at the beginning which are 0

This lets us start firing faster.

Change-Id: Idda068e3b0ca78da6ec5ab422d217d10d9c65e1c
Signed-off-by: Austin Schuh <austin.linux@gmail.com>
diff --git a/y2022/control_loops/superstructure/superstructure_status.fbs b/y2022/control_loops/superstructure/superstructure_status.fbs
index 92f3dbd..a1817a7 100644
--- a/y2022/control_loops/superstructure/superstructure_status.fbs
+++ b/y2022/control_loops/superstructure/superstructure_status.fbs
@@ -72,7 +72,7 @@
   catapult:frc971.control_loops.PotAndAbsoluteEncoderProfiledJointStatus (id: 6);
 
   solve_time:double (id: 7);
-  mpc_active:bool (id: 8);
+  mpc_horizon:uint8 (id: 8);
   shot_position:double (id: 16);
   shot_velocity:double (id: 17);