if at load all pbt terrain id are zero reset all to non pbr ids (so on version update they look the same automaticly)

diff --git a/OpenSim/Framework/RegionSettings.cs b/OpenSim/Framework/RegionSettings.cs
index 7b74a1f..6ac75c3 100644
--- a/OpenSim/Framework/RegionSettings.cs
+++ b/OpenSim/Framework/RegionSettings.cs
@@ -263,28 +263,28 @@ namespace OpenSim.Framework
         public UUID TerrainPBR1
         {
             get { return m_TerrainPBR1; }
-            set { m_TerrainPBR1 = value.IsZero() ? DEFAULT_TERRAIN_PBR_1 : value; }
+            set { m_TerrainPBR1 = value;}
         }

         private UUID m_TerrainPBR2 = UUID.Zero;
         public UUID TerrainPBR2
         {
             get { return m_TerrainPBR2; }
-            set { m_TerrainPBR2 = value.IsZero() ? DEFAULT_TERRAIN_PBR_2 : value; }
+            set { m_TerrainPBR2 = value; }
         }

         private UUID m_TerrainPBR3 = UUID.Zero;
         public UUID TerrainPBR3
         {
             get { return m_TerrainPBR3; }
-            set { m_TerrainPBR3 = value.IsZero() ? DEFAULT_TERRAIN_PBR_3 : value; }
+            set { m_TerrainPBR3 = value; }
         }
         private UUID m_TerrainPBR4 = UUID.Zero;

         public UUID TerrainPBR4
         {
             get { return m_TerrainPBR4; }
-            set { m_TerrainPBR4 = value.IsZero() ? DEFAULT_TERRAIN_PBR_4 : value; }
+            set { m_TerrainPBR4 = value; }
         }


diff --git a/OpenSim/Region/Framework/Scenes/Scene.cs b/OpenSim/Region/Framework/Scenes/Scene.cs
index 74df9f95..04d5ce1 100755
--- a/OpenSim/Region/Framework/Scenes/Scene.cs
+++ b/OpenSim/Region/Framework/Scenes/Scene.cs
@@ -856,14 +856,17 @@ namespace OpenSim.Region.Framework.Scenes
                 updatedTerrainTextures = true;
             }

-            if (rs.TerrainPBR1.IsZero())
-                rs.TerrainPBR1 = RegionSettings.DEFAULT_TERRAIN_PBR_1;
-            if (rs.TerrainPBR2.IsZero())
-                rs.TerrainPBR2 = RegionSettings.DEFAULT_TERRAIN_PBR_2;
-            if (rs.TerrainPBR3.IsZero())
-                rs.TerrainPBR3 = RegionSettings.DEFAULT_TERRAIN_PBR_3;
-            if (rs.TerrainPBR4.IsZero())
-                rs.TerrainPBR4 = RegionSettings.DEFAULT_TERRAIN_PBR_4;
+            if (rs.TerrainPBR1.IsZero() &&
+                rs.TerrainPBR2.IsZero() &&
+                rs.TerrainPBR3.IsZero() &&
+                rs.TerrainPBR4.IsZero())
+            {
+                rs.TerrainPBR1 = rs.TerrainTexture1;
+                rs.TerrainPBR2 = rs.TerrainTexture2;
+                rs.TerrainPBR3 = rs.TerrainTexture3;
+                rs.TerrainPBR4 = rs.TerrainTexture4;
+                updatedTerrainTextures = true;
+            }

             if (updatedTerrainTextures)
                 rs.Save();