[FIX] Error when importing customers #3659

Since ir_fields is written with the new API, when importing a partner record with country/state name (not id), it will call the 'name_search' function with the new arguments, which ommit cr, uid, ids, context.

Fixes #3659
Indeed, I may be missing something here. Since the `ids` was passed to `self.name_get()` in the old API, I thought you'd have to assign it to `self._ids` in the new API and not pass it as an argument.