fix typo

Author: zvonand

src/Storages/ObjectStorage/S3/Configuration.cpp

@@ -91,7 +91,7 @@ static const std::unordered_set<std::string_view> optional_configuration_keys =
     "expiration_window_seconds",
     "no_sign_request",
     "partition_strategy",
-    "partition_columns_in_data_file"
+    "partition_columns_in_data_file",
     /// Private configuration options
     "role_arn", /// for extra_credentials
     "role_session_name", /// for extra_credentials