fixed side channels -> float prop

Project/Assets/ML-Agents/Examples/Soccer/Scripts/AgentSoccer.cs

 using UnityEngine;
 using MLAgents;
 using MLAgents.Policies;
+using MLAgents.SideChannels;
 
 public class AgentSoccer : Agent
 {
 
     public override void OnEpisodeBegin()
     {
-        m_BallTouch = Academy.Instance.FloatProperties.GetPropertyWithDefault("ball_touch", 0);
+        m_BallTouch = SideChannelUtils.GetSideChannel<FloatPropertiesChannel>().GetPropertyWithDefault("ball_touch", 0);
         if (team == Team.Purple)
         {
             transform.rotation = Quaternion.Euler(0f, -90f, 0f);