[opw-web] Fix problem with attachments with periods in name

[Owen Taylor <otaylor src gnome org>]

commit f6c05c0fc3cf5310ccc326d4787c82d0aea3f740
Author: Owen W. Taylor <otaylor fishsoup net>
Date:   Tue Oct 18 11:21:08 2016 -0400

    Fix problem with attachments with periods in name

 modules/mod_attachment.php |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/modules/mod_attachment.php b/modules/mod_attachment.php
index edfbc6a..834b283 100644
--- a/modules/mod_attachment.php
+++ b/modules/mod_attachment.php
@@ -135,7 +135,7 @@ if ($action == 'add') {
         if ($error_message === '') {
             $content_type = '';
             $matches = null;
-            if (preg_match('/\.(.*?)$/', $name, $matches)) {
+            if (preg_match('/\.([^.]*)$/', $name, $matches)) {
                 $extension = strtolower($matches[1]);
                 if ($extension == 'pdf')
                     $content_type = 'application/pdf';