JDK-8352638 added missing @Override annotations to overridden methods.

The code review states, “I skipped adding @Override for anonymous classes,” although it was added in some cases.

WindowsMenuItemUIAccessor in WindowsMenu*UI classes now has the @Override annotation at the getMenuItem and getPart methods but lacks it at the getState method.

To address the inconsistency, add the @Override annotation to the getState method in WindowsMenuItemUIAccessor.