config(EJ2-4954): column chooser sample updated

Author: pipeline

src/grid/column/columnchooser-plnkr.json

@@ -5,9 +5,9 @@
             <e-column field='CustomerName' headerText='Customer Name' width='150' showInColumnChooser='false'></e-column>
             <e-column field='OrderDate' headerText='Order Date' width='130' format="yMd" textAlign="right"></e-column>
             <e-column field='Freight' headerText='Freight' width='120' format='C2' textAlign="right"></e-column>
-			<e-column field='ShippedDate' headerText='Shipped Date' width='130' format="yMd" textAlign="right"></e-column>
-            <e-column field='ShipCountry' headerText='Ship Country' visible='false' width='150'></e-column>
-			<e-column field='ShipCity' headerText='Ship City' visible='false' width='150'></e-column>
+            <e-column field='ShippedDate' headerText='Shipped Date' width='130' format="yMd" textAlign="right"></e-column>
+            <e-column field='ShipCountry' headerText='Ship Country' [visible]='false' width='150'></e-column>
+            <e-column field='ShipCity' headerText='Ship City' [visible]='false' width='150'></e-column>
         </e-columns>
     </ej-grid>
     <div id="description">