fix: 简化修改

package.json

 {
     "name": "panda-xform",
-    "version": "2.1.2",
-    "description": "2.1.2: 内部兼容写法",
+    "version": "2.1.3",
+    "description": "2.1.3: 简化修改",
     "keywords": [
         "panda-xform"
     ],

src/core/FormDesigner/index.js

-import React, { useRef, useState, useContext, forwardRef, createContext, useMemo, useLayoutEffect } from 'react'
+import React, { useRef, useState, useContext, forwardRef, useMemo, useLayoutEffect } from 'react'
 import { ConfigProvider, message, Modal, Button } from 'antd'
 import { ExclamationCircleOutlined } from '@ant-design/icons'
 import Generator, { defaultSettings } from 'fr-generator'
@@ -9,8 +9,6 @@ import FormRender from '../FormRender'
 import { isObject } from '../../utils'
 import Drag from '../components/Drag'
 
-export const GlobalStore = createContext(null)
-
 const FormDesigner = (props, ref) => {
 
   const { tableName } = props