[12.0] FIX receive_fe in case of base64 files coming from SDI

[eLBati]

Without this change, every SDI file would be doubly encoded in base64.

file_name_content_dict must be base64-encoded, as described in receive_fe documentation. Next methods must handle the "real" content, in order to process ZIP files also.

Sostituisce https://github.com/OCA/l10n-italy/pull/2916

[OCA-git-bot]

Hi @sergiocorato, some modules you are maintaining are being modified, check this out!

[eLBati]

Quindi questa sarebbe da chiudere in favore di https://github.com/OCA/l10n-italy/pull/2916 giusto?

[SirTakobi]

Quindi questa sarebbe da chiudere in favore di #2916 giusto?

Per me sì