Only pull shooter back when the battery voltage is high.

Change-Id: I9b57e181a875005227a1c46f2a78326f61664178
diff --git a/aos/common/controls/control_loop_test.cc b/aos/common/controls/control_loop_test.cc
index fd461b6..6c881f2 100644
--- a/aos/common/controls/control_loop_test.cc
+++ b/aos/common/controls/control_loop_test.cc
@@ -50,6 +50,7 @@
     new_state->voltage_5v = 5.0;
 
     new_state->voltage_roborio_in = 12.4;
+    new_state->voltage_battery = 12.4;
 
     new_state.Send();
   }