CSS Z-Index fix (loginas)

Also edited
.moodle/local/loginas/yiu/quickloginas/assests/skins/sam/quickloginas.css
29 .user-loginas-panel
{width:400px;background-color:#666;position:absolute;top:10%;left:10%;border:1px
solid #666;border-width    :0 5px 5px 0; z-index:100; }