[opw-web] Fix contract filename

[Owen Taylor <otaylor src gnome org>]

commit 186feee7c2c3794bba41414dfd6c445ef6607e3d
Author: Owen W. Taylor <otaylor fishsoup net>
Date:   Sun Jun 14 14:02:56 2015 -0400

    Fix contract filename

 modules/mod_contract.php |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/modules/mod_contract.php b/modules/mod_contract.php
index 325270b..46ad28a 100644
--- a/modules/mod_contract.php
+++ b/modules/mod_contract.php
@@ -169,7 +169,7 @@ if ($action == 'edit_student' || $action == 'edit_mentor') {
     $zipfile->close();
 
     header("Content-Type: application/zip");
-    header("Content-Disposition: filename='{$folder_name}.zip'");
+    header("Content-Disposition: filename=\"{$folder_name}.zip\"");
     header('Content-Length: ' . filesize($zipname));
     readfile($zipname);