tobago-tab-group: custom elements

issue: TOBAGO-1633: TS refactoring
diff --git a/tobago-theme/tobago-theme-standard/src/main/npm/ts/tobago-tab.ts b/tobago-theme/tobago-theme-standard/src/main/npm/ts/tobago-tab.ts
index eabfdcc..9b7a905 100644
--- a/tobago-theme/tobago-theme-standard/src/main/npm/ts/tobago-tab.ts
+++ b/tobago-theme/tobago-theme-standard/src/main/npm/ts/tobago-tab.ts
@@ -87,5 +87,5 @@
 
 document.addEventListener("DOMContentLoaded", function (event) {
   window.customElements.define('tobago-tab-group', TabGroup);
-  // window.customElements.define('tobago-tab', Tab);
+  window.customElements.define('tobago-tab', Tab);
 });