Fix position of material previews in Unlit scene.

Tests/GraphicsTests/RenderPipeline/HDRenderPipeline/Scenes/1xxx_Materials/1101_Unlit.unity

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+      value: 2
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-  m_LocalPosition: {x: 0.90950775, y: 2.3619227, z: -2.7148438}
+  m_LocalRotation: {x: -0, y: -0, z: -0, w: 1}
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   m_LocalScale: {x: 1, y: 1, z: 1}
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       propertyPath: m_LocalPosition.x
-      value: -9.590492
+      value: -17
-      value: 7.3639226
+      value: 8
-      value: 6.2851562
+      value: 9
-      value: 0
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   m_GameObject: {fileID: 780367057}
   m_LocalRotation: {x: -0, y: -0, z: -0, w: 1}
-  m_LocalPosition: {x: -7.4095078, y: 0.6380774, z: 2.7148438}
+  m_LocalPosition: {x: 0, y: 0, z: 0}
   m_LocalScale: {x: 1, y: 1, z: 1}
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-  m_LocalRotation: {x: 0, y: 0, z: 0, w: 1}
-  m_LocalPosition: {x: 0.90950775, y: -3.6399999, z: -2.7148438}
+  m_LocalRotation: {x: -0, y: -0, z: -0, w: 1}
+  m_LocalPosition: {x: -15.5, y: 2, z: 9}
   m_LocalScale: {x: 1, y: 1, z: 1}
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-  m_LocalPosition: {x: 0.90950775, y: -5.14, z: -2.7148438}
+  m_LocalRotation: {x: -0, y: -0, z: -0, w: 1}
+  m_LocalPosition: {x: -15.5, y: 0.5, z: 9}
   m_LocalScale: {x: 1, y: 1, z: 1}
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-  m_LocalPosition: {x: 0.90950775, y: 0.8619226, z: -2.7148438}
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   m_LocalScale: {x: 1, y: 1, z: 1}
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   m_LocalScale: {x: 1, y: 1, z: 1}
   m_Children:
   - {fileID: 518216940}