flex pcb 1st classification digit update

[kratsg]

[kratsg]

$ itksn parse 20UPGPQ1110169
Container:
    atlas_project = uEnumByteString.new(b'20', 'atlas_detector') (total 14)
    system_code = uEnumByteString.new(b'U', 'phaseII_upgrade') (total 15)
    project_code = uEnumByteString.new(b'PG', 'pixel_general') (total 13)
    subproject_code = uEnumByteString.new(b'PQ', 'Quad_PCB') (total 8)
    identifier = Container:
        FE_chip_version = uEnumByteString.new(b'1', 'ITkpix_v1') (total 9)
        PCB_manufacturer = uEnumByteString.new(b'1', 'EPEC') (total 4)
        number = b'10169' (total 5)

also isn't correct