55703384 fix missing duties

This change is for https://www.pivotaltracker.com/story/show/55703384

Real heading have `producline_suffix` of 80 and have associated measures. Wrapping headings like `||. Sets` in https://www.gov.uk/trade-tariff/chapters/63?country=&day=9&month=9&year=2013 have `producline_suffix` of 10 and do not have associated measures. We were including the ones with 10 in our measure fetching code and therefore some measure were missing. So now Commodity -> Heading association explicitly requires `producline_suffix` of 80.