[FIX] l10n_es_aeat: Modify tests according country_code change
[FIX] l10n_es_aeat: Modify tests according country_code change

Followup of b4fe6bf8e28db3a19e5b08f2ef3e962cec7358df, as tests were
testing the exact incorrect behavior without context.

cubells/l10n-spain,cubells/l10n-spain,cubells/l10n-spain