Disable speed matching on 2018.

It's not helping.

Change-Id: Idd8b20385f312e95eb49cfdd1a3f5f8db8d20670
diff --git a/y2018/control_loops/drivetrain/drivetrain_base.cc b/y2018/control_loops/drivetrain/drivetrain_base.cc
index 01a396d..ed40082 100644
--- a/y2018/control_loops/drivetrain/drivetrain_base.cc
+++ b/y2018/control_loops/drivetrain/drivetrain_base.cc
@@ -19,7 +19,7 @@
 
 const DrivetrainConfig<double> &GetDrivetrainConfig() {
   static DrivetrainConfig<double> kDrivetrainConfig{
-      ::frc971::control_loops::drivetrain::ShifterType::HALL_EFFECT_SHIFTER,
+      ::frc971::control_loops::drivetrain::ShifterType::SIMPLE_SHIFTER,
       ::frc971::control_loops::drivetrain::LoopType::CLOSED_LOOP,
       ::frc971::control_loops::drivetrain::GyroType::IMU_Z_GYRO,
       ::frc971::control_loops::drivetrain::IMUType::IMU_Y,