fixed URL parameter when calling course/(course_id)/members, re #1429

Merge request studip/studip!980

resources/assets/javascripts/lib/resources.js

@@ -165,10 +165,12 @@ class Resources
         STUDIP.api.GET(
             `course/${course_id}/members`,
             {
+                data: {
                     //The limit '0' results in a division by zero.
                     //Hopefully, the limit is set to a value high enough:
                     limit: 1000000
                 }
+            }
         ).done(function(data) {
             for (var attribute in data.collection) {
                 var user_id = data.collection[attribute].member.id;