PR feedback: Setting some the bounding sphere override back to zero after the Unity version upgrade process introduced NaNs.

Assets/Scenes/FaceTracking/FixationPoint.unity

   m_BounceIntensity: 1
   m_ColorTemperature: 6570
   m_UseColorTemperature: 0
-  m_BoundingSphereOverride: {x: 0, y: NaN, z: NaN, w: 2.6214713e+22}
+  m_BoundingSphereOverride: {x: 0, y: 0, z: 2.296e-41, w: 0}
   m_UseBoundingSphereOverride: 0
   m_ShadowRadius: 0
   m_ShadowAngle: 0