pass variable to function, fixes #1167

Closes #1167

Merge request studip/studip!716

resources/assets/javascripts/bootstrap/fullcalendar.js

@@ -19,7 +19,7 @@ STUDIP.ready(function () {
         setTimeout(() => {
             calendar.updateSize();
             if (ttl > 0) {
-                continuousRefresh(ttl - 1);
+                continuousRefresh(calendar, ttl - 1);
             }
         }, 200);
     }