修改加入课程弹出框样式

app/views/courses/join_private_courses.js.erb

@@ -1,4 +1,3 @@
 $('#ajax-modal').html('<%= escape_javascript(render :partial => 'join_private_course') %>');
 showModal('ajax-modal', '510px');
-$('#ajax-modal').addClass('new-watcher');
 $('#ajax-modal').css('height','330px');