Fix SteavVRCameraHook not expend head-eye-ear correctly

Author: lawwong

Assets/HTC.UnityPlugin/ViveInputUtility/Prefabs/ViveCameraRig.prefab

@@ -26,6 +26,8 @@ GameObject:
   - 4: {fileID: 404836}
   - 20: {fileID: 2071970}
   - 124: {fileID: 12406598}
+  - 81: {fileID: 8189340}
+  - 92: {fileID: 9261234}
   - 114: {fileID: 11413550}
   m_Layer: 0
   m_Name: Camera
@@ -399,6 +401,20 @@ Camera:
   m_StereoConvergence: 10
   m_StereoSeparation: 0.022
   m_StereoMirrorMode: 0
+--- !u!81 &8189340
+AudioListener:
+  m_ObjectHideFlags: 1
+  m_PrefabParentObject: {fileID: 0}
+  m_PrefabInternal: {fileID: 100100000}
+  m_GameObject: {fileID: 116882}
+  m_Enabled: 1
+--- !u!92 &9261234
+Behaviour:
+  m_ObjectHideFlags: 1
+  m_PrefabParentObject: {fileID: 0}
+  m_PrefabInternal: {fileID: 100100000}
+  m_GameObject: {fileID: 116882}
+  m_Enabled: 1
 --- !u!114 &11401118
 MonoBehaviour:
   m_ObjectHideFlags: 1

Assets/HTC.UnityPlugin/ViveInputUtility/Scripts/Misc/SteamVRCameraHook.cs

@@ -22,19 +22,6 @@ private void OnModuleActivated(VRModuleActiveEnum activatedModule)
     {
         if (activatedModule == VRModuleActiveEnum.SteamVR)
         {
-            var earsComp = default(SteamVR_Ears);
-            for (int i = transform.childCount - 1; i >= 0; --i)
-            {
-                earsComp = transform.GetChild(i).GetComponentInChildren<SteamVR_Ears>();
-                if (earsComp != null) { break; }
-            }
-
-            if (earsComp == null)
-            {
-                var ears = new GameObject("Camera (ears)", typeof(AudioListener), typeof(SteamVR_Ears));
-                ears.transform.SetParent(transform, false);
-            }
-
             if (GetComponent<SteamVR_Camera>() == null)
             {
                 gameObject.AddComponent<SteamVR_Camera>();