Fix so microseconds macro (u) in log_date_format works (#1490446)

Aleksander Machniak

2015-06-26 9aae1b7fc399b5d2cecb8f0d0df6a2ae4e749786

 program/lib/Roundcube/rcube.php

@@ -1231,11 +1231,7 @@
            $session_key = intval(self::$instance->config->get('log_session_id', 8));
        }

        if (empty($date_format)) {
            $date_format = 'd-M-Y H:i:s O';
        }

        $date = date($date_format);
        $date = rcube_utils::date_format($date_format);

        // trigger logging hook
        if (is_object(self::$instance) && is_object(self::$instance->plugins)) {