fix issue with mood display

src/Mood/Mood.js

@@ -14,7 +14,7 @@ export function Mood(props) {
     "BORED": "images/mood/mood-bored.svg"
   };
 
-  const config = this.props.node.getConfig()
+  const config = props.node.getConfig()
   if (config && 'displayMode' in config) {
     if (config.displayMode === "readme") {
         return <p className="about">The <b>current mood</b> of the agent regarding the valences of its actions.</p>;