Download.php: remove the redundant space before the closing parenthesis ')'.

Download.php

@@ -22,7 +22,6 @@ $time = time();
 
 if ( (isset($_SESSION["user_student_id"]) && strpos($file, $_SESSION["user_student_id"])) || $_SESSION['user_type'] == "Lecturer" || $_SESSION['user_type'] == "TA") {
     // 发送文件头部
-      
     header("Content-type: $type");
     header('Content-Disposition: attachment;filename="'.urldecode($filename).'"');
     header("Content-Transfer-Encoding: binary");