Update CustomTabPage.cs

Fixed bug that lost vdw schema

Author: RoelantVos

Virtual_EDW/CustomTabPage.cs

@@ -596,8 +596,9 @@ private void GenerateFromTemplate()
                         // Compile the template, and merge it with the metadata.
                         var template = Handlebars.Compile(localRichTextBoxGenerationTemplate.Text);
 
-                        //string serializedMapping = System.Text.Json.JsonSerializer.Serialize(dataObjectMappingList);
-                        string jsonInput = File.ReadAllText(dataObjectMappingList.metadataFileName);
+                        //string jsonInput = File.ReadAllText(dataObjectMappingList.metadataFileName);
+
+                        var jsonInput = System.Text.Json.JsonSerializer.Serialize(dataObjectMappingList);
                         JsonNode deserializedMapping = System.Text.Json.JsonSerializer.Deserialize<JsonNode>(jsonInput);
 
                         var result = template(deserializedMapping);