fix(accordion): fix CSS style scope

Author: OS-susmitabhowmik

core/src/components/item/item.ionic.scss

@@ -125,8 +125,10 @@ slot[name="end"]::slotted(*) {
 
 // Item in Accordion
 // --------------------------------------------------
-:host(.accordion-header-item) .item-native {
+:host(.accordion-header-item) {
   --background-activated: #{globals.$ion-bg-neutral-subtlest-press};
+}
 
+:host(.accordion-header-item) .item-native {
   @include globals.padding-horizontal(globals.$ion-space-400);
 }