Show sign up form if not signed in.

lms/static/js/toggle_login_modal.js

@@ -48,6 +48,10 @@
           })
 
           $(modal_id).fadeTo(200,1);
+          var notice = $(this).data('notice')
+          if(notice !== undefined) {
+            $(modal_id).find(".notice").show().html(notice);
+          }
           e.preventDefault();
 
         });