Correcting column selection in list compoenent

front/app/src/common/crud/list/list.component.ts

@@ -50,7 +50,7 @@ export class ListComponent implements OnInit {
                     }
                 }
             } else {
-                for (let column in this.columns) {
+                for (let column of this.columns) {
                     if (column in schemas.properties) {
                         this.displayedColumns.push(column);
                     }