Fix so plain text signature field uses monospace font (#1490435)

Aleksander Machniak

2015-06-17 3f4521bcf4b538b6ac54817cfad22b51e347546d

 index.php

@@ -2,7 +2,7 @@
/*
 +-------------------------------------------------------------------------+
 | Roundcube Webmail IMAP Client                                           |
 | Version 1.1.0                                                           |
 | Version 1.1.2                                                           |
 |                                                                         |
 | Copyright (C) 2005-2015, The Roundcube Dev Team                         |
 |                                                                         |