Update face tracking samples to use user facing camera

Assets/Scenes/FaceTracking/ARCoreFaceRegions.unity

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Assets/Scenes/FaceTracking/ARKitFaceBlendShapes.unity

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Assets/Scenes/FaceTracking/EyeLasers.unity

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Assets/Scenes/FaceTracking/EyePoses.unity

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Assets/Scenes/FaceTracking/FaceMesh.unity

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Assets/Scenes/FaceTracking/FacePose.unity

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Assets/Scenes/FaceTracking/FixationPoint.unity

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