Fix XML response in /enrollments

libs/routes/api.js

@@ -110,10 +110,7 @@ router.get('/enrollments', function(req, res) {
         if (req.query.format === 'csv') {
           res.csv(result.data);
         } else if (req.query.format === 'xml') {
-          res.set('Content-Type', 'text/xml');
-          res.send(xml({
-            result: result.data
-          }));
+          res.send(xml("result", JSON.stringify({enrollments: result.data})))
         }
         else {
           res.json({