fix: 修复 nested-select 弹出位置不正确问题 (#2693)

* fix: 修复 nested-select 弹出位置不正确问题

* 修复查找问题

package.json

@@ -1,6 +1,6 @@
 {
   "name": "amis",
-  "version": "1.3.1",
+  "version": "1.3.5-beta.2",
   "description": "一种MIS页面生成工具",
   "main": "lib/index.js",
   "scripts": {

scss/components/form/_nested-select.scss

@@ -1,3 +1,7 @@
+.#{$ns}NestedSelectControl {
+  position: relative;
+}
+
 .#{$ns}NestedSelect {
   position: relative;
   @include input-border();

src/renderers/Form/NestedSelect.tsx

@@ -602,7 +602,7 @@ export default class NestedSelectControl extends React.Component<
     return (
       <Overlay
         target={this.getTarget}
-        container={popOverContainer || findDOMNode(this)?.parentElement}
+        container={popOverContainer || (() => findDOMNode(this))}
         placement={'auto'}
         show
       >