Actually, what I needed to do was not to remove the wysiwyg property in the editor definition but to modify a section in my css file namely the following in the css was causing the bullets not to show:
body
, p, h1, h2, h3, h4, ul, li, table
{
border-style: none;
border-color: inherit;
border-width: medium;
margin: 0;
padding: 0;
text-align: left;
}