MSPA fields not populating correctly when parsing USNAT consent string

[efixler]

I'm generating GPP consents string, with a USNAT section, using https://iabgpp.com.

Here is an [example](see: https://iabgpp.com/#DBABLA~BVQVAAAAAABY.QA) string that reflects the settings that are required for the application I'm working on. The actual string is DBABLA~BVQVAAAAAABY.QA.

This string is decoded as expected with the iabgpp tool (and with other online tools as well), but when parsing this string with go-gpp the MspaXxx fields are not populated, they are all 0.

Here is a gist that demonstrates the issue.

Appreciate 👀 and assistance. Thanks!