[FIX] fields, test_new_api: monetary related custom

This commit allows for not copying the currency_field attribute
of a monetary field when the monetary field is related,
and when the currency_field attribute is not explicit

Before this commit, the currency_field attribute on the related monetary
was set as the one on the distant model

After this commit, the currency_field attribute takes the field on the
current model

Though the test may appear like an incoherent use case,
it is on the contrary totally legit, as web_studio allows it

OPW 1903113

closes odoo/odoo#28144

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