[FIX] payment_ogone: transaction code for alias AFU

The Automated File Upload (AFU) Ogone API requires a transaction code to be set,
either:
 - ATR for automated transactions
 - MTR for maintenance operations

The default is ATR and is used for submitting transactions in batch.
However, the server-to-server mode of payment_ogone only uses the AFU
API to create new credit card aliases, and not to process transactions.

Using the ATR transaction code requires the ATR feature to be available
in the Ogone Merchant account - a paying option that is otherwise
unused. Using MTR as the transaction code is sufficient for adding
aliases, and the corresponding feature (MTR) is available at no cost
in most Ogone Merchant Accounts.

References:
 - Ogone Advanced Batch:
    https://payment-services.ingenico.com/int/en/ogone/support/guides/integration%20guides/batch
 - Ogone Alias Management:
    https://payment-services.ingenico.com/int/en/ogone/support/guides/integration%20guides/alias/bulk-alias-management-via-batch

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