add missing folders version

OpenSim/Capabilities/Handlers/FetchInventory/FetchInvDescHandler.cs

@@ -624,6 +624,7 @@ namespace OpenSim.Capabilities.Handlers
             llsdFolder.parent_id = invFolder.ParentID;
             llsdFolder.name = invFolder.Name;
             llsdFolder.type = invFolder.Type;
+            llsdFolder.version = invFolder.Version;
             llsdFolder.preferred_type = -1;
 
             return llsdFolder;

OpenSim/Capabilities/LLSDInventoryFolder.cs

@@ -37,5 +37,6 @@ namespace OpenSim.Framework.Capabilities
         public string name;
         public int type;
         public int preferred_type;
+        public int version;
     }
 }