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

Aleksander Machniak

2015-06-17 3f4521bcf4b538b6ac54817cfad22b51e347546d

 tests/phpunit.xml

@@ -46,6 +46,7 @@
            <file>Framework/VCard.php</file>
            <file>Framework/Washtml.php</file>
            <file>MailFunc.php</file>
            <file>RcmailFunc.php</file>
        </testsuite>
        <testsuite name="Plugins Tests">
            <file>./../plugins/acl/tests/Acl.php</file>