Fix terrain shader compilation regression

Content/Editor/MaterialTemplates/Terrain.shader

@@ -3,6 +3,7 @@
 
 #define MATERIAL 1
 #define USE_PER_VIEW_CONSTANTS 1
+#define LoadObjectFromCB(var) var = GetObject()
 @3
 // Enables/disables smooth terrain chunks LOD transitions (with morphing higher LOD near edges to the lower LOD in the neighbour)
 #define USE_SMOOTH_LOD_TRANSITION 1
@@ -162,8 +163,6 @@ ObjectData GetObject()
     return object;
 }
 
-#define LoadObjectFromCB(var) var = GetObject()
-
 MaterialInput GetMaterialInput(PixelInput input)
 {
 	MaterialInput output = GetGeometryMaterialInput(input.Geometry);

Source/Shaders/MaterialCommon.hlsl

@@ -119,6 +119,7 @@ ObjectData LoadObject(Buffer<float4> objectsBuffer, uint objectIndex)
     return object;
 }
 
+#ifndef LoadObjectFromCB
 // Loads the object data from the constant buffer into the variable
 #define LoadObjectFromCB(var) \
     var = (ObjectData)0; \
@@ -129,6 +130,7 @@ ObjectData LoadObject(Buffer<float4> objectsBuffer, uint objectIndex)
     var.WorldDeterminantSign = WorldDeterminantSign; \
     var.LODDitherFactor = LODDitherFactor; \
     var.LightmapArea = LightmapArea;
+#endif
 
 // Material properties
 struct Material