fix: remove invalid tabindex (#19893)

Co-authored-by: Nikhil Tomar <63502271+2nikhiltom@users.noreply.github.com>

Author: Thejashwini123

packages/web-components/src/components/data-table/table-toolbar-content.ts

@@ -31,8 +31,10 @@ class CDSTableToolbarContent extends LitElement {
   size;
 
   updated(changedProperties) {
-    if (changedProperties.has('hasBatchActions')) {
-      this.setAttribute('tabindex', `${this.hasBatchActions ? '-1' : ''}`);
+    if (this.hasBatchActions) {
+      this.setAttribute('tabindex', '-1');
+    } else {
+      this.removeAttribute('tabindex');
     }
 
     if (changedProperties.has('size')) {