Add state code to OSD JSON output

[brownag]

Not sure why I didnt do this originally. The state codes denoting where the series is used -- from the first line of OSD are validated in the script. Should be simple to add as another element in the JSON result.

E.g. in PAIA series https://github.com/ncss-tech/OSDRegistry/blob/main/OSD/P/PAIA.txt from Hawaii

LOCATION PAIA                   HI