Remove nonexistent SampleUXScene from build settings

ProjectSettings/EditorBuildSettings.asset

   - enabled: 1
     path: Assets/Scenes/SimpleAR/SimpleAR.unity
     guid: 99c9720ab356a0642a771bea13969a05
-  - enabled: 1
-    path: Assets/Scenes/UX/SampleUXScene.unity
-    guid: 3b42d67a72bbc4004bf713db0e312326
   m_configObjects:
     UnityEditor.XR.ARCore.ARCoreSettings: {fileID: 11400000, guid: f8ce26fe3bc69499b9be4b2378e97a94,
       type: 2}