[DataTables] Remove unused declaration

Author: pentiminax

src/DataTables/assets/dist/controller.js

@@ -1,7 +1,6 @@
 import { Controller } from '@hotwired/stimulus';
 import DataTable from 'datatables.net-dt';
 
-let isDataTableInitialized = false;
 class default_1 extends Controller {
     constructor() {
         super(...arguments);

src/DataTables/assets/src/controller.ts

@@ -10,8 +10,6 @@
 import { Controller } from '@hotwired/stimulus';
 import DataTable from 'datatables.net-dt';
 
-let isDataTableInitialized = false;
-
 export default class extends Controller {
     declare readonly viewValue: any;