Disable cardboard audio listener by default in main prefab to work

around a bug in Unity's audio spatializer.

Cardboard/DemoScene/DemoScene.unity

@@ -73,7 +73,6 @@ NavMeshSettings:
     minRegionArea: 2
     widthInaccuracy: 16.666666
     heightInaccuracy: 10
-    tileSizeHint: 0
   m_NavMesh: {fileID: 0}
 --- !u!1 &159634548
 GameObject:
@@ -504,8 +503,9 @@ MonoBehaviour:
 --- !u!114 &417382011
 MonoBehaviour:
   m_ObjectHideFlags: 0
-  m_PrefabParentObject: {fileID: 0}
-  m_PrefabInternal: {fileID: 0}
+  m_PrefabParentObject: {fileID: 11400000, guid: b8b03d395f5734e98af91ccf44f9bf47,
+    type: 2}
+  m_PrefabInternal: {fileID: 437064765}
   m_GameObject: {fileID: 417382008}
   m_Enabled: 1
   m_EditorHideFlags: 0
@@ -641,6 +641,10 @@ Prefab:
       propertyPath: vrModeEnabled
       value: 1
       objectReference: {fileID: 0}
+    - target: {fileID: 11400000, guid: b8b03d395f5734e98af91ccf44f9bf47, type: 2}
+      propertyPath: m_Enabled
+      value: 1
+      objectReference: {fileID: 0}
     m_RemovedComponents:
     - {fileID: 11417550, guid: b8b03d395f5734e98af91ccf44f9bf47, type: 2}
   m_ParentPrefab: {fileID: 100100000, guid: b8b03d395f5734e98af91ccf44f9bf47, type: 2}
@@ -1251,8 +1255,9 @@ MonoBehaviour:
   m_Script: {fileID: 1301386320, guid: f5f67c52d1564df4a8936ccd202a3bd8, type: 3}
   m_Name: 
   m_EditorClassIdentifier: 
-  m_IgnoreReversedGraphics: 1
-  m_BlockingObjects: 0
+  m_Priority: 3
+  ignoreReversedGraphics: 1
+  blockingObjects: 0
   m_BlockingMask:
     serializedVersion: 2
     m_Bits: 4286578683
@@ -2784,8 +2789,9 @@ MonoBehaviour:
   m_Script: {fileID: 1301386320, guid: f5f67c52d1564df4a8936ccd202a3bd8, type: 3}
   m_Name: 
   m_EditorClassIdentifier: 
-  m_IgnoreReversedGraphics: 1
-  m_BlockingObjects: 0
+  m_Priority: 3
+  ignoreReversedGraphics: 1
+  blockingObjects: 0
   m_BlockingMask:
     serializedVersion: 2
     m_Bits: 4286578683

Cardboard/Prefabs/CardboardHead.prefab

@@ -64,8 +64,8 @@ GameObject:
   - 124: {fileID: 12400004}
   - 92: {fileID: 9246874}
   - 81: {fileID: 8100000}
-  - 114: {fileID: 11427708}
   - 114: {fileID: 11400006}
+  - 114: {fileID: 11400008}
   m_Layer: 0
   m_Name: Camera
   m_TagString: Untagged
@@ -302,13 +302,13 @@ MonoBehaviour:
   screenParallax: 0
   stereoPaddingX: 0
   stereoPaddingY: 0
---- !u!114 &11427708
+--- !u!114 &11400008
 MonoBehaviour:
   m_ObjectHideFlags: 1
   m_PrefabParentObject: {fileID: 0}
   m_PrefabInternal: {fileID: 100100000}
   m_GameObject: {fileID: 100006}
-  m_Enabled: 1
+  m_Enabled: 0
   m_EditorHideFlags: 0
   m_Script: {fileID: 11500000, guid: b1156c073149742478887bb24456f32d, type: 3}
   m_Name: 

Cardboard/Prefabs/CardboardMain.prefab

@@ -64,8 +64,8 @@ GameObject:
   - 124: {fileID: 12400004}
   - 92: {fileID: 9200004}
   - 81: {fileID: 8100000}
-  - 114: {fileID: 11417550}
   - 114: {fileID: 11400006}
+  - 114: {fileID: 11400000}
   m_Layer: 0
   m_Name: Main Camera
   m_TagString: MainCamera
@@ -423,6 +423,20 @@ Behaviour:
   m_PrefabInternal: {fileID: 100100000}
   m_GameObject: {fileID: 150432}
   m_Enabled: 1
+--- !u!114 &11400000
+MonoBehaviour:
+  m_ObjectHideFlags: 1
+  m_PrefabParentObject: {fileID: 0}
+  m_PrefabInternal: {fileID: 100100000}
+  m_GameObject: {fileID: 100006}
+  m_Enabled: 0
+  m_EditorHideFlags: 0
+  m_Script: {fileID: 11500000, guid: b1156c073149742478887bb24456f32d, type: 3}
+  m_Name: 
+  m_EditorClassIdentifier: 
+  globalGainDb: 0
+  worldScale: 1
+  quality: 1
 --- !u!114 &11400002
 MonoBehaviour:
   m_ObjectHideFlags: 1
@@ -511,26 +525,11 @@ MonoBehaviour:
   neckModelScale: 1
   autoDriftCorrection: 1
   electronicDisplayStabilization: 0
-  syncWithCardboardApp: 0
   autoUntiltHead: 1
   UseUnityRemoteInput: 0
   screenSize: 0
   deviceType: 1
   stereoScreenScale: 1
---- !u!114 &11417550
-MonoBehaviour:
-  m_ObjectHideFlags: 1
-  m_PrefabParentObject: {fileID: 0}
-  m_PrefabInternal: {fileID: 100100000}
-  m_GameObject: {fileID: 100006}
-  m_Enabled: 1
-  m_EditorHideFlags: 0
-  m_Script: {fileID: 11500000, guid: b1156c073149742478887bb24456f32d, type: 3}
-  m_Name: 
-  m_EditorClassIdentifier: 
-  globalGainDb: 0
-  worldScale: 1
-  quality: 1
 --- !u!114 &11450432
 MonoBehaviour:
   m_ObjectHideFlags: 1