Remove repeated rewrite rules.

erb/default.conf.erb

@@ -423,14 +423,14 @@ server {
       }
       location /<%= course_name %> {
         rewrite ^/<%= course_name %>/(.*)$ https://<%= course_name %><%= enote_domain_suffix %>/$1 redirect;
-        #proxy_pass http://course-website/$uri$is_args$args;
         break;        
       }
+      <% if course_name != course_id %>
       location /<%= course_id %> {
         rewrite ^/<%= course_id %>/(.*)$ https://<%= course_name %><%= enote_domain_suffix %>/$1 redirect;
-        #proxy_pass http://course-website/$uri$is_args$args;
         break;        
       }
+      <% end %>
       if (!-f $request_filename) {
         proxy_pass http://course-website/<%= course_id %>/$uri$is_args$args;
         break;