perf: 优化tree getIcon方法类型定义 (#2825)

src/components/Tree/src/BasicTree.vue

@@ -129,7 +129,7 @@
         getSelectedNode,
       } = useTree(treeDataRef, getFieldNames);
 
-      function getIcon(params: Recordable, icon?: string) {
+      function getIcon(params: TreeItem, icon?: string) {
         if (!icon) {
           if (props.renderIcon && isFunction(props.renderIcon)) {
             return props.renderIcon(params);