sorted and updated usages in focus provider

Author: StephenHodgson

Assets/MixedRealityToolkit/InputSystem/Focus/FocusProvider.cs

@@ -7,9 +7,9 @@
 using Microsoft.MixedReality.Toolkit.Internal.Interfaces.InputSystem;
 using Microsoft.MixedReality.Toolkit.Internal.Managers;
 using Microsoft.MixedReality.Toolkit.Internal.Utilities;
+using Microsoft.MixedReality.Toolkit.Internal.Utilities.Physics;
 using System;
 using System.Collections.Generic;
-using Microsoft.MixedReality.Toolkit.Internal.Utilities.Physics;
 using UnityEngine;
 using UnityEngine.EventSystems;