Add status message to password reset redirect

When the password is successfully reset, this controller doesn't pass a status message in the redirect. When I was using this controller, it looked like there was a built-in "reminders.reset" string passed back to match the "reset" key in the app/lang/en/reminders.php language file. There was a commit in that project (https://github.com/laravel/laravel/commit/9f31eede299fdd2faee9399f03a4328a173ad3ae#diff-b11d5eaf80c1cd8208c018b48a1f9d74) that added that missing string to the language file.