Hide non declarable commodities

This change is for https://www.pivotaltracker.com/story/show/45933857 and https://www.pivotaltracker.com/story/show/44956239.

This is the second attempt of identifying non declarable commodities that have product line suffixes of 80. By TARIC manual these goods codes should be declarable, but apparently they are not.

After deploy we expect https://tariff.preview.alphagov.co.uk/trade-tariff/commodities/3903909000 to be unreachable as well as search not finding 3903909000 or 6912003000. They redirect to heading pages as it's the next best choice for match of such code.