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

Aleksander Machniak

2015-06-17 3f4521bcf4b538b6ac54817cfad22b51e347546d

 program/steps/settings/edit_folder.inc

@@ -298,6 +298,8 @@

function rcmail_get_form_part($form, $attrib = array())
{
    global $RCMAIL;

    $content = '';

    if (is_array($form['content']) && !empty($form['content'])) {