Update MongoDBDictionarySource.cpp

Author: tavplubix

src/Dictionaries/MongoDBDictionarySource.cpp

@@ -99,7 +99,7 @@ void registerDictionarySourceMongoDB(DictionarySourceFactory & factory)
         return std::make_unique<MongoDBDictionarySource>(dict_struct, std::move(configuration), std::move(sample_block));
     };
     #else
-    auto create_dictionary_source = [](
+    auto create_dictionary_source = [](const String & /*name*/,
         const DictionaryStructure & /* dict_struct */,
         const Poco::Util::AbstractConfiguration & /* config */,
         const std::string & /* root_config_prefix */,