FileParser default value for extra_fields

[ecino]

#23 Introduced a problem in file_parser.py:

https://github.com/OCA/bank-statement-reconcile/blob/7.0/account_statement_base_import/parser/file_parser.py#L43

The parameter extra_fields is in fact mandatory as it is now, since it defines the conversion_dict and the keys_to_validate fields. Thus, it should not be named extra_fields anymore, but fields and should not take a None default value. If no value is passed, line 62 will raise an AttributeError (NoneType has no keys)

[pedrobaeza]

Can you please make a PR with the changes you mentioned?

Thanks.

[github-actions]

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