Don't create two DB pools in todo example.

examples/todo/src/main.rs

@@ -82,7 +82,7 @@ fn rocket() -> (Rocket, Option<db::Conn>) {
     };
 
     let rocket = rocket::ignite()
-        .manage(db::init_pool())
+        .manage(pool)
         .mount("/", routes![index, static_files::all])
         .mount("/todo/", routes![new, toggle, delete])
         .attach(Template::fairing());