fix: report all columns from annual stats as JSON

The previous report was only showing the first column, incorrectly. For
now, just report all columns as JSON, and in future we'll add more
formatting as we work on analytics.

Test-bot: skip

Author: mcdurdin

script/statistics/annual.php

@@ -29,9 +29,4 @@
 
   $stats = new \Keyman\Site\com\keyman\api\AnnualStatistics();
   $data = $stats->execute($mssql, $startDate, $endDate);
-  $rows = [];
-  foreach($data as $row) {
-    $rows[$row[0]] = ["Value" => $row[2], "Comment" => $row[1]];
-  }
-
-  json_print($rows);
+  json_print($data);