remove postcodes from countries that don't have them

The postcodes will only be removed as a 'computed postcode' they
are still searchable for the given object.

settings/icu_tokenizer.yaml

@@ -32,6 +32,8 @@ sanitizers:
         - streetnumber
       convert-to-name:
         - (\A|.*,)[^\d,]{3,}(,.*|\Z)
+    - step: clean-postcodes
+      convert-to-address: yes
     - step: split-name-list
     - step: strip-brace-terms
     - step: tag-analyzer-by-language