Group (division) scoreboard JSON files use an old format

[johnbrvc]

Describe the issue:
When the scoreboard client generates the scoreboard JSON report for each division (group) the format of the JSON file is wrong. This issue was discovered by the DOMjudge team when trying to compare scoreboards.

To Reproduce:
Run the scoreboard thick client on a contest that uses multiple division (groups).
Look in the "results" folder for one of the generated ".json" files.
Note the format is incorrect:

[
   {
      "problems" : [
         {
            "first_to_solve" : true,
            "label" : "A",
            "num_judged" : 1,
            "num_pending" : 0,
            "solved" : true,
            "time" : 15
         },
         {
            "first_to_solve" : false,
            "label" : "B",
            "num_judged" : 1,
            "num_pending" : 0,
            "solved" : true,
            "time" : 27
         },

The JSON file should have a header, and, each problem should contain a "problem_id" property as in:

{
   "contest_time" : "",
   "event_id" : "48ae19d2-07eb-4123-9b26-cca6851ed330",
   "rows" : [
      {
         "problems" : [
            {
               "num_judged" : 3,
               "num_pending" : 0,
               "problem_id" : "billboards",
               "solved" : true,
               "time" : 158
            },
            {
               "num_judged" : 1,
               "num_pending" : 0,
               "problem_id" : "bingoforthewin",
               "solved" : true,
               "time" : 26
            },

Expected behavior:
A CLICS style scoreboard JSON file should be produced.

Actual behavior:
A "2016" style scoreboard is produced (older specification).

Environment:
All

Log Info:

Screenshots:

Additional context:
The older StandingsJSON2016 is being used when generating scoreboard JSON reports for groups instead of the newer CLICSScoreboard.