comment for the hidden collapse button

src/skins/vector/views/organisms/LeftPanel.js

@@ -40,6 +40,7 @@ module.exports = React.createClass({
             classes += " collapsed";
         }
         else {
+            // Hide the collapse button until we work out how to display it in the new skin
             // collapseButton = <img className="mx_LeftPanel_hideButton" onClick={ this.onHideClick } src="img/hide.png" width="12" height="20" alt="<"/>   
         }