Hotfix: Show contest time

src/core.rs

@@ -533,6 +533,10 @@ pub fn show_task<T: MedalConnection>(conn: &T, task_id: i32, session_token: &str
                 data.insert("contestid".to_string(), to_json(&c.id));
                 data.insert("seconds_left".to_string(), to_json(&left_secs));
 
+                if c.duration > 0 {
+                    data.insert("duration".to_string(), to_json(&true));
+                }
+
                 Ok(("task".to_owned(), data))
             }
         }