Remove steer angle conversion.

This is basically the same as lgsvl/simulator#1372, except that the target wheel angle is left unmodified (assumed to be in range `[-1, 1]`) instead of treating it as radians.
While this is in conflict with the comment on the `lgsvl_msgs` repo, it seems to match the implementation of the `lgsvl_interface` in `AutowareAuto`.

Ros2Conversions.cs

@@ -523,34 +523,12 @@ public static Detected3DObjectArray ConvertTo(Detection3DArray data)
 
         public static Data.VehicleControlData ConvertTo(Data.Lgsvl.VehicleControlData data)
         {
-            float Deg2Rad = UnityEngine.Mathf.Deg2Rad;
-            float MaxSteeringAngle = 39.4f * Deg2Rad;
-            float wheelAngle = 0f;
-
-            if (data.target_wheel_angle > MaxSteeringAngle)
-            {
-                wheelAngle = MaxSteeringAngle;
-            }
-            else if (data.target_wheel_angle < -MaxSteeringAngle)
-            {
-                wheelAngle = -MaxSteeringAngle;
-            }
-            else
-            {
-                wheelAngle = data.target_wheel_angle;
-            }
-
-            // ratio between -MaxSteeringAngle and MaxSteeringAngle
-            var k = (float)(wheelAngle + MaxSteeringAngle) / (MaxSteeringAngle*2);
-
-            // target_gear are not supported on simulator side
-
             return new Data.VehicleControlData()
             {
                 TimeStampSec = Convert(data.header.stamp),
                 Acceleration = data.acceleration_pct,
                 Braking = data.braking_pct,
-                SteerAngle = UnityEngine.Mathf.Lerp(-1f, 1f, k),
+                SteerAngle = data.target_wheel_angle,
                 SteerInput = data.target_wheel_angular_rate,
                 TargetGear = (GearPosition)(int)data.target_gear,
             };