remove a bit of randomness in tests

Change-Id: I31ed60b848a9ab6b3814f4705fd2896d75d0ce88
diff --git a/frc971/control_loops/fridge/fridge_lib_test.cc b/frc971/control_loops/fridge/fridge_lib_test.cc
index b5e7bbe..0fd3501 100644
--- a/frc971/control_loops/fridge/fridge_lib_test.cc
+++ b/frc971/control_loops/fridge/fridge_lib_test.cc
@@ -27,7 +27,7 @@
 // position.
 class FridgeSimulation {
  public:
-  static constexpr double kNoiseScalar = 1.0;
+  static constexpr double kNoiseScalar = 0.1;
   // Constructs a simulation.
   FridgeSimulation()
       : arm_plant_(new StateFeedbackPlant<4, 2, 2>(MakeArmPlant())),