fix: Enable a11yScrollToTopPositioning feature flag (#20070)

Author: sdrozdsap

projects/storefrontapp/src/app/spartacus/spartacus-features.module.ts

@@ -439,7 +439,7 @@ if (environment.cpq) {
         a11yHamburgerMenuTrapFocus: true,
         useExtendedMediaComponentConfiguration: true,
         showRealTimeStockInPDP: false,
-        a11yScrollToTopPositioning: false,
+        a11yScrollToTopPositioning: true,
         a11yWrapReviewOrderInSection: true,
         enableCarouselCategoryProducts: true,
         enableSecurePasswordValidation: true,