fix: remove unused variable

Author: Singond

lib/script-view.js

@@ -34,7 +34,6 @@ export default class ScriptView extends MessagePanelView {
   parsePositionConfig(value) {
     // Get the configured position of the view as one of the
     // valid values of the MessagePanelView.position parameter.
-    let position;
     switch (value) {
       case 'Top':
         return 'top';