fix(tree): fix el-tree accordion attribute only takes effect on root nodes (#1996) (#2523)

Co-authored-by: Qian Jie <jie.qian@blockheaders.com>

packages/tree/src/tree-node.vue

@@ -103,6 +103,7 @@ export default defineComponent({
       type: Object as PropType<TreeOptionProps>,
       default: () => ({}),
     },
+    accordion: Boolean,
     renderContent: Function,
     renderAfterExpand: Boolean,
     showCheckbox: {

packages/tree/src/tree.vue

@@ -15,6 +15,7 @@
       :key="getNodeKey(child)"
       :node="child"
       :props="props"
+      :accordion="accordion"
       :render-after-expand="renderAfterExpand"
       :show-checkbox="showCheckbox"
       :render-content="renderContent"