Prop type check repair (#2919)

* repair intent check wraning

* change doublequote to singlequote, add semicolon

* optimized code

* modify type-check wraning

frontend/src/components/select-editor/select-editor.js

@@ -20,7 +20,7 @@ class SelectEditor extends React.Component {
     super(props);
     this.state = {
       isEditing: false,
-    }
+    };
     this.options = [];
   }