Fix holiday region lookup for ISO 3166-2 codes
This was broken so far if we only have a holiday definition for the corresponding ISO 3166-1 area. Now this is symmetric and also checks for the ISO 3166-1 code for the requested code.
This was broken so far if we only have a holiday definition for the corresponding ISO 3166-1 area. Now this is symmetric and also checks for the ISO 3166-1 code for the requested code.