fix(megamenu-tab): change default value override method (#12088)

### Related Ticket(s)

Closes #12087 

### Description

Updates the method by which the megamenu-tab component overrides inherited values.

### Testing

I'm not sure there's a good way to test this change and its impact on projects using react-wrapped components. For now, we should focus on making sure not to introduce regressions into the web components.

### Changelog

**Changed**

- fixes a bug in react-wrapped components

packages/web-components/src/components/masthead/megamenu-tab.ts

@@ -25,11 +25,11 @@ const { stablePrefix: c4dPrefix } = c4dSettings;
  */
 @customElement(`${c4dPrefix}-megamenu-tab`)
 class C4DMegaMenuTab extends CDSTab {
-  /**
-   * Disable unneeded properties inherited from CDS Content Switcher Item.
-   */
-  closeOnActivation = false;
-  hideDivider = false;
+  connectedCallback() {
+    super.connectedCallback();
+    this.closeOnActivation = false;
+    this.hideDivider = false;
+  }
 
   render() {
     const { disabled, selected, value } = this;