re-add lost group_delete js event

JohnDoh

2013-12-29 1fdb55a99eea99eea325c642b4c06d866d0d1b19

 program/steps/utils/modcss.inc

@@ -55,7 +55,7 @@

if ($source !== false && preg_match($ctype, $headers)) {
    header('Content-Type: text/css');
    echo rcmail_mod_css_styles($source, preg_replace('/[^a-z0-9]/i', '', $_GET['_c']));
    echo rcube_utils::mod_css_styles($source, preg_replace('/[^a-z0-9]/i', '', $_GET['_c']));
    exit;
}