fix(Teleport): reapply height offset on teleport

The height offset given when casting the ray on the height adjust
teleport also needs to be reapplied to the final y position otherwise
the destination y is not correct as it is minus the height adjust
value given to the raycast down.

Assets/SteamVR_Unity_Toolkit/Scripts/VRTK_HeightAdjustTeleport.cs

@@ -44,14 +44,15 @@ protected override Vector3 GetNewPosition(Vector3 tipPosition, Transform target)
 
         private float GetTeleportY(Transform target, Vector3 tipPosition)
         {
-            float newY = this.transform.position.y;
+            var newY = this.transform.position.y;
+            var heightOffset = 0.1f;
             //Check to see if the tip is on top of an object
-            var rayStartPositionOffset = Vector3.up * 0.1f;
+            var rayStartPositionOffset = Vector3.up * heightOffset;
             var ray = new Ray(tipPosition + rayStartPositionOffset, -transform.up);
             RaycastHit rayCollidedWith;
             if (target && Physics.Raycast(ray, out rayCollidedWith))
             {
-                newY = tipPosition.y - rayCollidedWith.distance;
+                newY = (tipPosition.y - rayCollidedWith.distance) + heightOffset;
             }
             return newY;
         }