fix(VTreeview): don't display expanded items as activated

fixes #21721
closes #21724

Author: KaelWD

packages/vuetify/src/components/VList/VListGroup.tsx

@@ -81,7 +81,6 @@ export const VListGroup = genericComponent<VListGroupSlots>()({
     const toggleIcon = computed(() => isOpen.value ? props.collapseIcon : props.expandIcon)
     const activatorDefaults = computed(() => ({
       VListItem: {
-        active: isOpen.value,
         activeColor: props.activeColor,
         baseColor: props.baseColor,
         color: props.color,

packages/vuetify/src/components/VTreeview/VTreeviewGroup.tsx

@@ -29,7 +29,6 @@ export const VTreeviewGroup = genericComponent<VListGroupSlots>()({
       VTreeviewItem: {
         prependIcon: undefined,
         appendIcon: undefined,
-        active: vListGroupRef.value?.isOpen,
         toggleIcon: toggleIcon.value,
       },
     }))