fix:保存并继续添加本地文件筛选bug修复

src/modules/prepare-lesson/modal/SelectPrepareFileModal.jsx

@@ -526,6 +526,7 @@ class SelectPrepareFileModal extends React.Component {
         footer={footer}
         width={680}
         maskClosable={false}
+        destroyOnClose={true}
         closeIcon={<span className="icon iconfont modal-close-icon">&#xe6ef;</span>}
         onCancel={this.handleClose}
         className="select-prepare-file-modal"