Fix some JS issues

CTFd/plugins/challenges/assets/standard-challenge-update.js

@@ -376,7 +376,7 @@ function loadchal(id, update) {
         //})
         if (typeof update === 'undefined')
             $('#update-challenge').modal();
-    }
+    });
 }
 
 function openchal(id){

CTFd/themes/admin/static/js/chal-new.js

@@ -1,3 +1,4 @@
+$.ajaxSetup({ cache: false });
 function load_chal_template(challenge){
     $.get(script_root + challenge.templates.create, function(template_data){
         var template = Handlebars.compile(template_data);