Fix click to add for flux functions

ui/src/flux/components/FluxScriptEditor.tsx

@@ -51,9 +51,13 @@ class FluxScriptEditor extends PureComponent<Props, State> {
     }
   }
 
-  public componentDidUpdate(prevProps) {
+  public componentDidUpdate(prevProps: Props) {
     const {status, visibility} = this.props
 
+    if (prevProps.script !== this.props.script) {
+      this.setState({script: this.props.script})
+    }
+
     if (status.type === 'error') {
       this.makeError()
     }